Answer:
directional selection
Explanation:
Directional selection is a type of natural selection where individuals exhibiting an extreme phenotype for a given trait are favored over the mean or other extreme phenotype. This type of selection can lead to drastic and fast changes in allele frequencies between generations in a population, being particularly important in speciation processes. Directional selection is common under environmental changing conditions (e.g., weather, climate, food availability, etc) or when individuals migrate to other regions in order to adapt to new environmental pressures.
what is respiration and the different types
Answer:
It involves inhalation and exhalation of gases. Internal respiration involves gas exchange between the blood and body cells. Cellular respiration involves the conversion of food to energy. Aerobic respiration is a cellular respiration that requires oxygen while anaerobic respiration does not.
Which of the following is/are parts of the Cell Theory? explantion
Answer:
All organisms are composed of one or more cells. Cells come from other cells by division. Cells are the smallest living things. Eukaryotic cells have evolved from prokaryotic cells.
Explanation:
How is density affected when the salinity increases?
Answer:
The density of water increases as the salinity increases. The density of seawater (salinity greater than 24.7) increases as temperature decreases at all temperatures above the freezing point. The density of seawater is increased by increasing pressure
[tex] \huge \sf \green{Question}[/tex]
How is density affected when the salinity increases?
[tex] \huge \sf \green{Answer}[/tex]
When salt is dissolved in fresh water, the density of the water increases because the mass of the water increases.
Salinity describes how much salt is dissolved in a sample of water. The more salt there is dissolved in the water, the greater its salinity. When comparing two samples of water with the same volume, the water sample with higher salinity will have greater mass, and it will therefore be more dense.
A chromosomal mutation is best described as-
A. Mutations that involve changes in the number or structure of chromosomes in a cell or organism.
B. Changes in the “reading section” of a protein code frame that affect the subsequent amino acids.
C. An amino acid substitution that changes all of the subsequent protein codes on the chromosome.
D.a change in the genetic make-up of an organism that causes speciation to occur in a population.
Answer:
A
Explanation:
chromosomal mutation definition. A mutation involving a long segment of DNA. These mutations can involve deletions, insertions, or inversions of sections of DNA. In some cases, deleted sections may attach to other chromosomes, disrupting both the chromosomes that loses the DNA and the one that gains it.
PLEASE HELP!
describe two ways to transfer electric charge
.Answer: conduction or polarization
Answer:
conduction, friction
Explanation:
Friciton: When insulating materials rub against each other, they may become electrically charged . Electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. The material that gains electrons becomes negatively charged.
Conduction: During charging by conduction, both objects acquire the same type of charge. If a negative object is used to charge a neutral object, then both objects become charged negatively. In order for the neutral sphere to become negative, it must gain electrons from the negatively charged rod.
write the general characteristics of bryophytes?
Explanation:
Vascular tissues are absent.
-Sex organs are multicellular and jacketed.
-Archegonium is flask shaped with tubular neck and a swollen venter. ...
-Sexual reproduction is of oogamous type. .
-The sporophyte of sporogonium is parasitic over the gametopphyte.
Answer:
Plants occur in damp and shaded areas.
The plant body is thallus like, i.e. prostrate or erect. It is attached to the substratum by rhizoids, which are unicellular or multicellular. They have a root-like, stem-like and leaf-like structure and lack true vegetative structure.
What is a scientific theory? The sentences above help to describe a scientific theory. One sentence is not quite
accurate though. Choose the sentence that needs to be modified and make the necessary modification so it may be
included in the description of a theory.
A)
D. A scientific theory has a simple basis: an experiment done to test a
hypothesis.
B)
C. Theories are descriptions, often mathematical descriptions of natural
phenomenon;
A. A scientific theory is based on a scientific investigation that supports a
hypothesis.
D)
B. When new information does not support a scientific theory, the theory
may be revised or sometimes rejected.
Answer:
Original sentence: When new information does not support a scientific theory, the theory may be revised or sometimes rejected.
New changed sentence: When the results of the experiment do not support a hypothesis, the hypothesis must be revised or rejected to state a new scientific theory.
Explanation:
The scientific theory is a conceptual framework used to explain facts or phenomena and to make predictions.
The theory is fundamental to science because it allows scientists to organize and understand observations.
The construction of a theory begins with a hypothesis. The scientist believes that a phenomenon occurs in a certain way, so he/she performs observations under the scientific method to prove that his/her hypothesis is valid or not valid. The systematization of the observations and the empirical data collected might derive from a scientific theory that explains the analyzed phenomenon.
A scientific theory is a knowledge that has been contrasted in several ways.
3.2 State whether each of the phrases applies to A only, B only,
both A and B or none. Write down A only, B only, both A and B
or 'none' next to the question number.
For example, 3.2.6 None
3.2.1 Mitosis
A cloning
B chromosomes
3.2.2 Chromosome
A chromatid
B spindle fibre
3.2.3 Phases in the cell cycle
A interphase
B mitosis
3.2.4 Tumour
A benign
B malignant
3.2.5 Bone cancer
A carcinoma
B leukaemia
Answer:
3.2.1. A only
3.2.2. A only
3.2.3. A and B
3.2.4. A and B
3.2.5. None
Explanation:
- 3.2.1
Mitosis is a kind of cellular division that produces two genetically identical daughter cells. Whereas, cloning is a technique used to create identical cells. This means that mitosis applies to cloning.
- 3.2.2
A chromatid is a half of a replicated chromosome. Together, a replicated chromosome is called SISTER CHROMATIDS. One of them is called a Chromatid. Spindle fibre is a structure involved with the division of the genetic material during cell division.
- 3.2.3
The cell cycle consists of two stages interphase and mitotic phase. Hence, interphase and mitosis are part of the cell cycle.
- 3.2.4
A tumour is a cancerous mass of cells. Tumour can either be BENIGN i.e. not capable of spreading to other parts or MALIGNANT i.e. capable of spreading to other parts.
- 3.2.5
Cancer is an uncontrolled division of cells and can occur in virtually all organs of the body. Bone cancer is a type of cancer that affects the bone cells. However, carcinoma (starts in the skin) and leukaemia (blood cancer) are unrelated to bone cancer.
In which substances can the electrons move randomly?
Answer:
Conductors
Explanation: the substances which have a large number of free electrons and offer a low resistance are called conductors
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Answer:
Reduction of fossil fuels.
Explanation:
A fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis that release energy in combustion. Source: Wikipedia
Answer:
the answer would be a)
Explanation:
how has electricity generation changed in Minnesota since 2001?
Answer:
Since 2001, the amount of electricity generated by Minnesota's independent power producers has increased dramatically. The majority of the electricity generated in Minnesota is generated by utilities; however, the amount provided by independent power producers has increased significantly over the last two decades.
1
Name the gas produced by the pondweed in the light.
[1 mark]
Answer:
This process of making sugar and oxygen is called photosynthesis. Pond weed uses the carbon dioxide which is dissolved in the water it is in. The amount of dissolved carbon dioxide can be varied by adding sodium hydrogen carbonate (carbon dioxide solution) to the water.
Explanation:
Help Me Please!!!
Why is the air temperature shown on Sensor 4 (location 4) different from Sensor 5 (location 5), even though they are at the same latitude?
Answer:because they are not in the same place
Explanation:
what is the function of the stratified squamous epithelium of this type of tissues
Answer:
The stratified squamous epithelium provides protection against mechanical stress, chemical abrasions, and even radiation. The keratinized epithelium present on the surface of the skin blocks out the harmful radiation and prevents the exposure of internal tissues and organs to the radiation.
Explanation:
¡I hope it helps you!
Chemicals that stay in the environment
for a long time are known as
A. unstable
B. reactive
C. persistent
D. corrosive
Answer:
Persistent item c
Which option best defines half-life?
Answer:
Where are the answer choice
Which of the following is the responsibility of government to save habitats? Select all that apply.
A. using fertilizers always
B. using too much chemicals
C. establishing more open spaces and regulations
D. using less fuels
The normal shape of an enzyme is as shown in structure A. If the enzyme's shape changes to that shown in structure B, what are two consequences of this change? Less binding of substrate more binding of substrate won't follow the lock-and-key pattern of enzyme binding will follow the lock-and-key pattern of enzyme binding a substrate reaction independent of the enzyme structure
Answer:
There is no image showing the shape of an enzyme, however, the question can still be answered based on basic understanding. The answers are;
- Less binding of substrate
- won't follow the lock-and-key pattern of enzyme binding
Explanation:
An enzyme is a biological catalyst that regulates the rate of chemical reactions in living systems. Enzymes are proteinous in nature and every protein is made up of an amino acid sequence. The amino acid sequence forms a three-dimensional shape that determines the functionality of the enzyme.
Enzymes catalyze reactions by binding to their substrates in a lock and key pattern. This makes enzymes substrate-specific. If the enzyme's normal shape changes, the following will occur:
- Less binding of substrate
- won't follow the lock-and-key pattern of enzyme binding.
3.2 State whether each of the phrases applies to A only, B only,
both A and B or none. Write down A only, B only, both A and B
or 'none' next to the question number.
For example, 3.2.6 None
3.2.1 Mitosis
A cloning
B chromosomes
3.2.2 Chromosome
A chromatid
B spindle fibre
3.2.3 Phases in the cell cycle
A interphase
B mitosis
3.2.4 Tumour
A benign
B malignant
3.2.5 Bone cancer
A carcinoma
B leukaemia
Answer:
3.2.1 Mitosis - Both A and B
3.2.2 Chromosome - Both A and B
3.2.3 Phases in the cell cycle - Both A and B
3.2.4 Tumor - Both A and B
3.2.5 Bone cancer - B only
Explanation:
1. Mitosis is a process of cell replication , in which one cell divides into two identical daughter cells having the same number of chromosomes. In mitosis, the two new cells are genetically identical. Copies of the chromosome (containing the DNA) are made and distributed equally to each cell. Some organisms such as bacteria reproduce entirely by mitosis.
In cloning, an organism that is genetically identical to another organism is made from that original organism. Cloning can occur naturally or may be done by man artificially. In nature, many organisms produce clones through asexual reproduction for example bacteria produces clones by mitotic binary fission.
Therefore, the phrase mitosis, applies to both A and B.
2. Chromosomes are structures found within the nucleus of cells that contain the genetic material of the organism. The chromosomes are composed two identical structures called chromatids thar are joined together to at a constricted point known as centromere.
During cell division, long fibres extend from the centroiles at the ends of the cell to the centromere of the nucleus in order to pull them apart. These long fibres are known as spindle fibres.
Therefore, the phrase, Chromosome, applies to both A and B
3. The phases in the cell cycle are divided into two major stages : interphase and Mitosis. In interphase, the cell grows and makes a copy of its DNA.
In mitotis, the cell DNA divides into two sets, the cytoplasm divides, forming two new cells.
Thus, phases of cell cycle applies to both A and B
4. Tumours are abnormal growths occurring in any part of the body which may be benign or malignant.
Benign tumours are harmless growth which do not have spread out to other tissues to form various cancers.
Malignant tumors spread out from their point of growth to other tissues leading to cancer in these other tissues and organs.
Therefore, tumors applies to both benign and malignant.
5. Bone cancer refers to abnormal growth of bone cells.
Carcinomas are cancers of the skin and tissue lining of organs.
Leukaemia are cancers affecting the bone marrow, whereby the bone marrow makes abnormal white blood cells, red blood cells and platelets.
Thus, bone cancer only applies to B.
how do sandy beaches from????
Explanation:
waves pounding pebbles into smaller and smaller pieces
Answer:
The answer is D :)
Explanation: have a great day and be safe
First to answer 15points plus brainliest!!!!
Nuclear Energy is produced by
Answer:
Fission or the act of splitting uranium atoms
Answer:
Nucler fission
Explanation:
Clearly C and D arent correct.
In nuclear fission(A), a uranium atom(mildly radioactive) is split by a nutreon, which realeases nucler energy.
In nucler fussion(B), which only occurs in the sun and stars, two nulcei are combined to make a even bigger nuclei, this does not produce nuclear energy.
Hope this helps :)
Please fill out the Punnett Square with the correct Alleles, then answer the questions.
Bb | bb
Bb | bb
The chance of having recessive traits is 50%
The chance of having dominant traits is 50%
Hope this helps ! :)
What’s the answer please??!!!
Answer:
A
Explanation:
Almost all embryos of vertabrites look the same at early embryo stages, even humans to other organisms. This is because they all have a common ancestory, adn orginated from a organism with an embryo that looked like this.
It is clear it cannot be the other answers for the folowing reasons:
The organisms will definatly not look the same, considering they are birds and reptiles. The 2nd answer speaking of geography isnt very accurate, and cannot be determined because as I said above, any vertibrate embro looks very similar, and close geopgraphy isnt what made them look similar.
Again, all vertabrites have the same embryos, and that is a phylum. Not a genus. There are many genus in a phylum, and the ecaxt one cannot be determines.
As I said above, HUMANS look simiar to BIRDS and REPTILES, but clearly grow to be much different.
Answer:
A: the organisms share a common ancestory
These thoughs and facts hopefully answer you question, hope it helps!
positive impacts humans have on water
Answer:
Positive Human Interaction When people build dams channeling off large bodies of water, the water builds up along the edge of the lake, pond, or stream creating very fertile soil from the constant watering and these areas on the outside of lakes and ponds are used by humans for growing and farming crops.
Explanation:
Tadpoles must undergo a major metamorphosis to become frogs. This change includes reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore. Amazingly, all of these changes are induced by triiodothyronine. What is the most likely explanation for such a wide array of effects of triiodothyronine
Answer:
The most likely explanation is that different body parts have different tissues which in turn have different thyroxine receptors. This leads to different signal transduction pathways.
Explanation:
The triiodothyronine absorption through different tissues lead to different signal transduction pathways.
Organism A has blunt teeth, while organism B has sharp ones. Identify the organisms on basis of their feed habit and give another point of difference between these two organisms
Answer:
- Organism A is most likely a herbivore
- Organism B is most likey a carnivore
Explanation:
Based on feeding habit, organisms, usually animals, can be classified into three categories namely: herbivores, carnivores and omnivores.
- Herbivores are those organisms that feed on vegetative matter i.e. plants while carnivores are those organisms that feed on flesh of other animals or organisms. Based on what they feed on, herbivores are adapted to possess blunt teeth (for chewing) like Organism A in this question while carnivores are adapted to possess sharp teeth (for tearing flesh) like Organism B.
Based on the above explanation, organism A is most likely a HERBIVORE while organisms B is most likely a CARNIVORE.
- Another notable point of difference between herbivores and carnivores, which is likely to differentiate organism A and B as well, is that herbivores possess digestive enzyme- amylase in their saliva while carnivores do not. Herbivores need AMYLASE to break down complex carbohydrate (starch) in the plants they feed on.
Which of these are part of the respiratory system? (Select all that apply.)
larynx
sinuses
heart
lungs
Answer:
larynx, sinuses, lungs
Explanation:
Answer:
larynx, sinuses, lungs
I know this is old, but just in case anyone else needs it
How did the formation of the ozone layer contribute to the existence of life on Earth?
Answer:
It blocked the suns harmful UV rays !
Hope this helps!
please help me on this I'll give the most brainliest whoever get's this question right
High blood pressure is also called ______.
a.
arteriosclerosis
c.
anemia
b.
hypertension
d.
heart failure
Answer:
High blood pressure is called hypertension or often referred to as the silent killer as it shows no symptoms at all.
Hope that helps!