Answer:
1- Presence of phenotypic variation
2- some phenotypic variation due to genetic variation
3- the given trait has an impact on fitness
Explanation:
The evolutionary theory by natural selection proposed by Darwin in his publication “On the origin of species” (1859) is based on a series of assumptions that enable to understand the amazing biodiversity on the Earth. First, individuals are not identical among them, i.e., there exists variation in the traits among the members of a given population, species, etc. Second, phenotypic variation leads to differential survival and reproduction of the organisms that are best fitted to the environment (i.e., competence among the members of the population). Finally, phenotypic traits are passed from generation to generation (i.e., phenotypic variation is inheritable), thereby favoring offspring from parents more adapted to the environment.
Pretend you’re a researcher in charge of conducting new research on the flu research on the flu virus. Identify four scientific questions you’d like to answer through your research.
Answer:
Explanation:
A scientific researcher performs scientific methods to answer any natural process. The researcher will follow the protocol of a scientific method which includes: observe the natural phenomenon, ask related questions, suggest a hypothesis, perform the experiment and suggest answers.
In the given question if the researcher has to study about the flu virus, the possible questions he would ask will be:
1. The life cycle of the flu virus.
2. Effect of the virus on the life of an organism.
3. The mechanism used by the virus to replicate and to infect any organism.
4. Molecular mechanism of a virus.
Answer:
My 4 scientific questions would be:
* How does the virus start every year?
* How do we make the virus fully go away?
* Why does this virus happen?
* Can this virus become a serious issue in the future?
Explanation:
1What do we call an environment free of bacteria?
sterlle
clean
empty
Infected
Answer:
sterile
Explanation:
sterile means free from micro-organisms
Which part of an organism is preserved in cast and mold fossils? a. skin b. bone c. muscle d. soft tissue
Answer: bones
Explanation:
Answer:
B ) Bone
Explanation:
How sensitive to changes in water temperature are coral reefs? To find out, scientists examined data on sea surface temperatures and coral growth per year at locations in the Gulf of Mexico and the Caribbean Sea.
Answer:
emperatures and coral growth per year at locations in the Gulf of Mexico and the Caribbean Sea.
Explanation:
What body system regulates the acid based balance of the blood?
Answer:
Kidney
Explanation:
The kidney is the body system that regulates the acid base balance of the blood.
2. What structures or abilities are essential to the success of organisms who do not use
photosynthesis?
Answer:
Ability to perform locomotion with their legs
Explanation:
Plants and animals are two distinct species of organisms. Plants are capable of using photosynthesis to obtain their food due to the unique structures that can capture light energy in their cells (autotrophic). Animals, on the other hand, are heterotrophic i.e. cannot perform photosynthesis and therefore, rely on other organisms for food.
Since animals depends on eating other organisms to obtain food/energy, their possession of LEGS or ability to LOCOMOTE is very instrumental to their success as non-photosynthetic or heterotrophic organisms. This enables them leave one position in search for food and resources
Move/chase is essential to the success of organisms that do not use photosynthesis.
What is photosynthesis?Photosynthesis is a series of chemical reactions by which autotrophic organisms such as plants can produce energy and structures by using solar radiation.
Heterotrophic organisms such as animals need to move in order to obtain their food.It is for that reason that heterotrophic organisms exhibit different structures to be motile (e.g., flagella).In conclusion, move/chase is essential to the success of organisms that do not use photosynthesis.
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Changing a solid to a liquid to a gas is changing the ___ of matter
Answer:
state or RARELY form
Explanation:
What is meant by the scientific term "blob”?
11. Iron is a solid metal, and oxygen is a gas. When iron and oxygen atoms combine, they
form a solid called iron oxide.
How should iron oxide be categorized?
A atom
B element
C gas
D molecule
Answer:
D. Molecule
when iron and oxygen combine they will make a molecule
Describe how you know the number of protons and electrons in an atom.
The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons.
What type of chemical bond if formed when one atom loses an electron and another atom gains an electron ?
Answer:
ionic bond
Explanation:
An ionic bond is formed when one atom loses an electron and another atom gains an electron.
What is an Ionic bond?An ionic bond is defined as the formation of a complete transfer of some electrons from one atom to another. The atom loses one or more electrons called cation which is a positively charged ion while the atom gains one or more electrons called anion which is negatively charged ion.
For example, Sodium atom loses an electron to form [tex]Na^+[/tex] ion while thi electron is gained by chlorine atom to form [tex]Cl^-[/tex] ion. [tex]Na^+[/tex] ion combines with [tex]Cl^-[/tex] ion to form ionic compound NaCl.
There is a large difference in electronegativity between the two atoms due to which the bond is more polar i.e. ionic as compared to covalent bond where the electrons are shared more equally.
Thus, an ionic bond is formed when one atom loses an electron and another atom gains an electron.
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5. Could Trypsin work in the stomach?
Why do you think that?
In 1936 J.W. McKay crossed a stock melon plant that produced tan seeds with a plant that
produced red seeds and got the following results:
tan seeds x red seeds à F1 13 tan seeds à F2 76 tan + 24 red seeds
a) Which is dominant, red or tan seeds?
b) Why did you answer as you did in a)?
c) What is the genotype of the F1 melons?
d) Look at the F2 results to decide whether the normal phenotypic ratio is within experimental
error of 3:1.
Answer:
Explanation:
Lets Tan seed be TT
Red seed be tt
A cross between TT ×tt will produce 4 Tt
TT× tt
!
F1 Tt Tt Tt Tt
a. Tan seed is dominant with an allele TT. It effect dominate that of red seed indicating it is a dominant traits while red seed is a recessive traits.
A dominant trait is a traits that is expressed in the phenotype of an organism the F1 generation are all Tan seeds this shows that the trait is dominant.
The genotype of the F1 melon is Tt in a dominant form
The F2 result follows the mendelian principle where segregation occur leading to a phenotypic ratio of 3:1
72Tan seeds:24red seeds
Where the 72 tan seed has the highest ratio and 24 red seeds has the smaller ratio.
Tt ×Tt
!
F2 TT Tt Tt tt
Phenotypic ratio 3:1
Why do natural polymers not pose as much of an issue in landfills as synthetic polymers?
Natural polymers are cheap to recycle, and synthetic polymers are expensive to recycle.
Natural polymers are expensive to recycle, and synthetic polymers are cheap to recycle.
Natural polymers are not biodegradable, and synthetic polymers are biodegradable.
O Natural polymers are biodegradable, and synthetic polymers are not biodegradable.
Answer:
Most polymers, including poly(ethene) and poly(propene) are not biodegradable . This means that microorganisms cannot break them down, so they: cause a litter problem if disposed of carelessly. last for many years in landfill sites.
Natural polymers do not pose as much of an issue in landfills as synthetic polymers because natural polymers are biodegradable, and synthetic polymers are not biodegradable. Thus, the correct option for this question is D.
What do you mean by Natural polymers?Natural polymers may be defined as materials that are significantly found in nature or are extracted from plants or animals. These polymers are essentially required in order to accomplish the metabolic activities of plants and animals.
Examples of natural polymers are cellulose, pectin, starch, chitin, etc. These polymers are easily decomposed by microorganisms and do not harm nature. While synthetic polymers like polyesters, polyethylene, polypropene, etc. may not decompose and are not utilized by living entities in any form.
Therefore, the correct option for this question is D.
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Explain, in your own words, how you would use the light microscope to view a wet mount of a protist, assuming the microscope is plugged in and that the light source is on. Please use at least the following 9 structures in your description and underline them as you use them: stage, stage clip(s), stage knob(s), eyepiece, scanning objective lens, low power objective lens, high power objective lens, coarse focus knob, and fine focus knob.
Answer:
Please find the detailed explanation/description on how to use the light microscope to view a wet mount of a protist. The 9 structures mentioned in the question are in CAPS.
Explanation:
- Firstly, the slide containing the wet mount of the protist is prepared and placed at the centre of a lowered STAGE. The STAGE CLIPS over the sides of the slide are used to hold it in place.
- The revolving turret or nosepiece is turned so that the LOWEST POWER OBJECTIVE LENS is in position i.e. directly above the sample/slide. The SCANNING OBJECTIVE LENS, the lowest objective lens with power of 4x is used initially.
- The slide is viewed through the EYEPIECE, and the image is brought into focus using the STAGE KNOBS.
- The COARSE FOCUS KNOB is turned until the protist on the slide is brought into broad focus. The FINE FOCUS KNOB is then used to bring the image on the slide into sharp focus.
N.B: The OBJECTIVE LENS should not touch the cover slip on the slide during this process.
- When the protist on the slide is clear using lowest power objective lens, the revolver turret can be rotated to allow HIGHER POWER OBJECTIVE LENS.
- Due to higher magnification of the HIGH POWER OBJECTIVE LENS, the protist might need to be refocused using the FOCUS KNOBS.
Answer:
A light microscope is an instrument commonly used in the laboratory which makes use of light rays for viewing and enlarging smaller objects/organisms.
The wet protist is first of all put on the slide then the slide is placed on the Stage which is the flat podium where the slides containing the samples are put for viewing.
The Stage clips are then used to hold the slide containing the wet protist in proper place for a better viewing result.
The Coarse and fine focus knobs are used to adjust the stage by raising and lowering it .
The major difference is that the coarse focus knobs move more rapidly and is used with a low power objective lens while the fine focus knobs move less rapidly and are to be carefully controlled as it functions with a high power objective lens
The Eyepiece which is also referred to as the Ocular lens is then used to view the protist.
However, the view can then be adjusted with the Scanning objective lens which provides an image of the protist with the least magnification of 4X when compared to other lenses.
The low power objective lens and high power objective lens have magnifications of 10X and 40X respectively and can be used to view smaller structures of the protists which the naked eyes and scanning objective lens can't view.
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flow chart of components of blood
Explanation:
Plasma
White blood cells
Red blood cells
from top to base of test tube
Normally menstruation occurs when ________.
A) blood levels of FSH fall off
B) blood levels of estrogen and progesterone decrease
C) blood levels of estrogen and progesterone increase
D) the corpus luteum secretes estrogen
Answer:
B) blood levels of estrogen and progesterone decrease
Explanation:
Menstruation is a normal phenomenon in a fertile female. It is the biological process whereby the flow of blood from the uterine lining occurs. Menstruation usually occurs after implantation, which is the attachment of a fertilized egg in the uterus, fails to occur.
On a monthly basis, the female reproductive organ prepares the uterus for implantation, which is physiological stimulated by an increase in the blood levels of estrogen and progesterone. However, when there is no implantation, the level of these two reproductive hormones (estrogen and progesterone) fall, and menstruation is stimulated to occur.
Menstruation occurs when the blood levels of oestrogen and progesterone decrease.
Menstruation can be described as the release of blood from the reproductive tract of a female. This cycle is mainly driven by the female hormones such as oestrogen and progesterone. During this period, the level of the oestrogen and progesterone drastically reduces.
Blood flow lasts between 1-5 days but it differs in different females, it last for 3 days in some and 5 days in some other ladies and is most times accompanied with cramps.
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How might factors like hormones, chemicals, and the weather influence criminal behavior?
Answer:
These substances alter signaling pathways associated with cognitive functions
Explanation:
It is well known that cortisol hormone is secreted by the adrenal glands in stressful situations. In criminals and convicts, constant and high levels of cortisol have been observed, thereby it is believed that this hormone is associated with criminal behaviors through a 'constant stress-stimulation state'. Moreover, addictive drugs are known to literally destroy the brain. These drugs bind to hormone-like receptors involved in feedback responses. In consequence, after drug consumption, neural pathways will be altered and cognitive functions will be harmed. Finally, evidence linking wheater with criminal behavior is not conclusive.
Over time, plants developed structural adaptations of vascular systems and seeds in order to
Answer:
Transport materials such as fluid and propagation
Explanation:
Planta with vascular systems are called tracheophytes, this plant dominate the ecosystem in terrestrial habitat and were successful because of their tube like vascular tissues.
The vascular tissues are used in transporting of fluids such as minerals, photosynthate and are usually made up of cells that are long and narrow end that forms tubes. There are two different types of vascular tissues, called xylem and phloem.
This systems help transport nutrient required for plants growth and development to avoid plant loss and redundant growth.
Seed plants allows them for propagation and ensures continuity
Answer:
colonize land ecosystems.
Explanation:
penn
Classify each cell as haploid or diploid. 1. microspore:
2. first polar body:
3. spermatid:
4. ovum:
5. secondary oocyte:
6. primary spermatocyte:
7. microsporocyte:
8. oogonium:
9. megaspore:
10. spermatogonium:
Answer:
microspore: haploid
2. first polar body: haploid
3. spermatid: haploid
4. ovum: haploid
5. secondary oocyte: haploid
6. primary spermatocyte: diploid
7. microsporocyte: diploid
8. oogonium: diploid
9. megaspore: haploid
10. spermatogonium: diploid
Your answer
Explanation:
1. Microspore is a haploid spore produced by mostly ferns. They give rise to male gametophytes, which in turn produces sperm cell.
2. Polar body is one of the haploid cells that forms during the process of oogenesis (gametogenesis), specifically when the primary oocyte undergoes an unequal division.
3. A spermatid is an haploid cell that arises from the second meiotic division of the spermatogonia.
4. The ovum is the female gamete of most sexual reproducing organisms. It is also called the EGG CELL. It is haploid.
5. Secondary oocyte are haploid cells that results from the meiotic division of the primary oocyte.
6. Primary oocyte is the diploid cell that starts the meiotic division during oogenesis. It arises from the mitotic division of the oogonium.
7. The microsporocyte is the diploid cell that undergoes meiotic division to produce microspores in ferns and other land plants.
8. Oogonium are the diploid stem cells that initially starts the oogenesis process. It undergoes mitosis to form the primary oocyte, which divides meiotically till the ovum is formed.
9. Megaspore is a haploid spore that gives rise/germinates to the female gametophyte in ferns. The female gametophyte produces the haploid eggs.
10. Spermatogonium are undifferentiated stem cells that produces the sperm cells in males via the process of spermatogenesis. The spermatogonia is diploid in nature
Do particles have weight and or mass?
a study that uses empirical evidence to prove that is valid is called A: Science B: Pseudoscience C: Non-Science D: Space Force
Answer:
A
Explanation:
what is a saturated fatty acid
Answer:
A saturated fat is a type of fat in which the fatty acid chains have all or predominantly single bonds. A fat is made of two kinds of smaller molecules: glycerol and fatty acids. Fats are made of long chains of carbon atoms. Some carbon atoms are linked by single bonds and others are linked by double bonds.
Answer:
Image B. this is because saturated fats only have single carbon to carbon bonds.
Explanation:
PLEASE HELP ASAP!!! CORRECT ANSWERS ONLY PLEASE!! What was Mohorovičić's observation? A. Seismic waves travelled at constant speeds. B. Seismic waves travelled at varying speeds. C. Seismic waves could not go through the brittle crust. D. Seismic waves penetrated all Earth's layers.
Answer:
Seismic waves traveled at varying speeds.
Explanation:
The Moho Discontinuity was discovered by one Croatian seismologist, Andrija Mohorovicic. He realized that the speed of a seismic wave depends on the density of the material the wave is moving through. Mohorovicic interpreted the acceleration of seismic waves observed within the Earth's crust as a change in composition of matter within the Earth.
hope this helps <3
Mohorovicic's observation was that Seismic waves travelled at varying speeds. Thus, option B is correct.
What was Mohorovicic's observation ?In 1909, Andrija Mohorovičić, a Croatian seismologist, found the limit between the hull and the mantle by noticing the unexpected increment of seismic waves as they passed from the covering to the mantle. In view of the unexpected leap in wave speed, he had the option to derive that there should be an adjustment of the creation in the stones at that profundity.
The limit between the hull and the mantle is by and large known as the "Moho" since most researchers experienced difficulty finding the exceptional characters expected to compose Mohorovičić's whole last name accurately utilizing a western console. ha, just joking. "Moho" is only utilized on the grounds that it is a more limited word.
In 1912, Beno Gutenberg involved perceptions of the unexpected drop in P wave speed along with the perception of a "shadow zone" in which direct P and S waves don't show up at seismograms a specific separation from the source (favoring this later in this illustration) to compute that the profundity of the center mantle limit should be at around 2900 km. In 1936, Inge Lehmann noticed a second "shadow zone" inside the actual center to find the limit between the inward center and the inner layer.
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What are sources of free energy in cells?
Answer:
The correct answer is "Phosphoryl group transfer reactions; electron transfer reactions; concentration gradients across biological membranes".
Explanation:
The missing options of this question are:
1. Phosphoryl group transfer reactions
2. Electron transfer reactions
3. Concentration gradients across biological membranes
4. Protein synthesis
a. 2, 3, and 4
b. 1 and 2
c. 4
d. 1, 2, and 3
The correct answer is option d. "1, 2, and 3".
Free energy in cells is defined as forces that can be extracted from systems that allow cells to perform its biological activities. Phosphoryl group transfer reactions, electron transfer reactions and concentration gradients across biological membranes are three examples of sources of free energy in cells. Phosphoryl group transfer reactions regulate metabolism, gene regulation and signal transduction; electron transfer reactions participate in varios biological process at a molecular level; while concentration gradients across biological membranes are sources of stored energy and participate in vital processes such as cellular respiration.
PLEASE HELP! Thank you
Answer:
Explanation:
I would go with C
Would Volcano change the climate?
Answer:
yes
Explanation:
When volcano brusts out then the harmful radiation and harmful particles gone mixed into the climate which makes the climate and environment pollute . Radiation covers the atmosphere and block the sun rays . When sunlight doesn't comes to the surface of the earth then the climate starts to pollutes. Hence volcano change the climate.
Thank you..
Newtons third law is sometimes called??? Help
Answer:
equal and opposite are called Newtown third law
Which of the following is not true of biotechnology? Biotechnology raises just as many concerns as it does benefits. Biotechnology is a new branch of science. Biotechnology is a huge part of life. Biotechnology raises ethical concerns.
Answer:
Biotechnology is a new branch of science
Explanation:
The begining of biotechnology was somewhere around the 1920s i think so it is not old
Biotechnology is a new branch of science is not true
Biotechnology dates back several thousand years to when people inadvertently discovered the use of yeast and bacteriaWhat is biotechnology?It is the integration of natural sciences and engineering sciences in order achieve the application of organism, cells, parts thereof and molecular analogues for the products and services.
What is yeast?It is a eukaryotic, single celled microorganism classified as members of Fungi kingdom
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A part of an mRNA has the sequence AGA. Use the table below to figure out which amino acid is coded for by AGA, then use the table to figure out which change to the sequence would indicate a silent mutation. A. AGG B. AUA C. GAG D. GGA
Answer: it’s AGG
Explanation:
A part of an mRNA has the sequence AGA. By Using the table below to figure out which amino acid is coded for by AGA, then after using the table it has been figured out that it is AGG. Thus, option A is correct.
What is the procedure to use the codon?The procedure to use this codon table for the code CAU, we first find C on the left side which is A on the top, as well as U on the right. When this has been found, the amino acid will be given to the right of the codon anf just from this table, we can find that CAU has the codon for the Histidine.
A silent mutation has been known as the mutation that has been occured and there will be no detectable change in that particular amino acid sequence. The mutation that has been occurs must still produce the same amino acid in this case, Histidine must still be produced.
If we look at the particular table, there has only one other codon that gives the Histidine amino acid. This codon has CAC. So we know that the original codon is the CAU and the other codon is CAC - and at last we can say that the third nucleotide in the codon can be mutated from a uracil (U) to a cytosine (C) and still produce histidine, causing a silent mutation.
Therefore, option A is the correct option.
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