explain the differences between the particles of a pure substance and the particles of a mechanical mixture
Answer:
A substance is pure if it is a single substance, and it is made up of only one type of particle. If there is more than one substance, and therefore more than one type of particle, it is a mechanical mixture, the particles can be easily distinguished, due to their non-uniform composition. The composition of a mechanical mixture is variable and their components may be separated by physical or mechanical means because they are not chemically bound.
Explanation:
A pure substance is one that has a composition and characteristic properties that do not change, whatever the physical conditions in which it is found; that is, the physical transformations do not affect it. In other words, pure substances will be made up of particles that are identical to each other. Mechanical mixture are the result of the physical union of two or more substances which are called components, these can be elements or compounds, whose particles do not mix uniformly. The components of the mixtures have different properties, such as the state of aggregation, the density or the solubility. These properties allow substances to be identified and facilitate the separation of the components of a mixture, that is, through physical or mechanical processes we can isolate and obtain the components that make up the mechanical mixtures.
Compare and contrast genetic engineering to the process of natural selection. Select all statements that are true
Available options are:
1. By selecting the genetic information that is passed on to future generations, genetic engineering is similar to natural selection.
2. Unlike natural selection, genetic engineering selects the organisms most beneficial to the environment.
3. By selecting the genetic information that is passed on to future generations, genetic engineering can happen at a different rate than natural selection.
4. Like natural selection, genetic engineering may be used on all organisms, including humans.
5. The effects of genetic engineering apply only to the organism selected, but natural selection affects the entire population.
Answer:
1, 2, and 3
Explanation:
Given that Genetic engineering is a scientific process of altering the genetic makeup or elements of organisms such that these organisms develop preferable traits.
On the other hand, Natural selection is a process that deals with the impartial selection of traits, that is without human input, thereby making organisms more fitted to their immediate environment.
Therefore, considering the available options, the comparison, and contrast of genetic engineering to the process of natural selection are:
1. By selecting the genetic information that is passed on to future generations, genetic engineering is similar to natural selection.
2. By selecting the genetic information that is passed on to future generations, genetic engineering can happen at a different rate than natural selection.
3. Like natural selection, genetic engineering may be used on all organisms, including humans.
Answer: 1, 3, and 4
Explanation: :)
How is it that the order of colors of the rainbow is always the same
(ROYGBIV)
Answer:
The color of order
The pattern of light is always the same in a primary rainbow because each color is reflected at its own particular wavelength. In a primary rainbow, the colors will be in the order of red, orange, yellow, green, blue, indigo and violet.
Explanation:
hope it helps .. don't forget to mark brainiest
:)
Answer:
Red, Orange, Yellow, Green, Blue, Indigo and Violet
Which of the following statements is correct? Which of the following statements is correct? The sperm and egg have twice as many chromosomes as the parental cells. Geneticists use the terms "son" and "daughter" to distinguish between cells resulting from cell division. Meiosis results in gametes that are used in reproduction. Asexual reproduction requires the production of eggs and sperm.
Answer:
Meiosis results in gametes that are used in reproduction.
Explanation:
The sperm and egg have twice as many chromosomes as the parental cells. INCORRECT. Sperm and eggs are the gametes, and they have only half the number of chromosomes that can be found in the germ cells or somatic cells. Gametes are haploid, n. Geneticists use the terms "son" and "daughter" to distinguish between cells resulting from cell division. INCORRECT. The term "daughter cells" is used to refer to the products of cell division. "son cells" is not used at all. Meiosis results in gametes that are used in reproduction. CORRECT. Germ cells are the reproductive, diploid cells produced by testes and ovaries. After meiosis, each germ cell produces four haploid cells that are the gametes. Gametes´ destiny is to merge during fecundation, creating a new diploid cell called the zygote. The zygote is a diploid cell that suffers successive mitosis to form the new organism.Asexual reproduction requires the production of eggs and sperm. INCORRECT. Only sexual reproduction needs gametes. Cells that reproduce asexually duplicate their genetic material and cytoplasmic content and then divide, producing a new cell identical to its parental. This is the case of binary fission, for example.Why do flowers have such colorful petals? *
A. So you can see them at night
B. To trap insects
C. To scare away predators
D. To attract animals for pollination
E. Petals don't have color
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Based on the information in the data table and the cladogram shown below, which of the following best describes the evolutionary history of lizards? (4 points)
Amniotic membrane Bipedal locomotion Hair Jaws Lack of tail Lungs
Gorilla X X X X X X
Human X X X X X X
Lamprey
Leopard X X X X X
Lizard X X X
Salamander X X
Shark X
Image depicts a cladogram with lamprey, shark, salamander, lizard, leopard, gorilla, and human represented. Shark diverges from lamprey with the introduction of jaws. Salamander diverges from shark with the introduction of lungs. Lizard diverges from salamander with the introduction of amniotic membrane. Leopard diverges from lizard with the introduction of hair. Gorilla diverges from leopard with the absence of a tail. Human diverges from gorilla with bipedal locomotion.
They are more closely related to lampreys than they are to leopards.
They evolved into a separate species as a result of the presence of an amniotic membrane.
They have jaws and lungs but lack an amniotic membrane.
They share a more recent common evolutionary ancestor with salamanders than they do with sharks. I think is D
Answer:
D. They share a more recent common evolutionary ancestor with salamanders than they do with sharks.
Explanation: Just took the test and got it correct
The cladogram shows that lizards share a more recent common evolutionary ancestor with salamanders than they do with sharks.
What is cladogram?A cladogram is a diagram in the form of a tree wgich shows the evolutionary relationship between organisms based on similarities shared in structure or function.
The cladogram given show that sharks, lizards and salamanders have a common origin but that Lizard diverges from salamander with the introduction of amniotic membrane.
Therefore, Lizards share a more recent common evolutionary ancestor with salamanders than they do with sharks.
Learn more about cladogram at: https://brainly.com/question/12275760
Retired police captain Gary P. died of an apparent heart attack while scuba diving. Within hours of his death, his wife asked the hospital to retrieve a sample of his sperm. The following year, she became pregnant as a result of in vitro fertilization. Is her son entitled to police department pension benefits based on the information presented in the opening section of the chapter on this case study?'
Answer:
Yes. He's entitled to have the benefits.
Explanation:
If they conduct a DNA testing and found out that the result is positive between Capt. Gary and the boy. Was he the only child? If not they can also test his siblings if Capt. Gary wasn't able coz he's dead.
And if his mom is lying. I wanted her behind bars.
The smallest blood vessels that connect arteries and veins, and allow blood to pick up
and drop off substances with surrounding cells.
Which of the following would likely lead to competition between the same species?.
A. Needing the same biotic factors
B. Needing the same abiotic factors
C. Having the same niche in a habitat
D. All of the bove
Answer:
D.
Explanation:
All of these reasons can be factors for competetion between the same species. one usual factor is when there are two groups of wolves and one small supply of their food source, this would lead to competetion between both groups for the source of food.
Your hand touches something super gooey and icky. In the space below, describe the steps in the neural pathway that leads to pulling your hand out of the goo. Start with the stimulus
Solution :
A neural pathway may be defined as the connection that is formed by the axons which is projected from the neurons to make a synapses onto the neurons in some another location. It also enables a signal to be sent from one of the region of the nervous system to the another.
In the context, the steps in the neural pathways of our brain which leads us to pull our hand out of a icky and sticky goo is :
ICKY STIMULUS --- TOUCH / MECHANORECEPTORS ---- SENSORY NEURONS --- SPINAL CORD ---- PROCESSES IN BRAIN ---- SPINAL CORD ---- MOTOR NEURONS ---- MUSCLE MOVEMENT.
The Mid-Atlantic Ridge is a great example of continental-continental divergent boundary since it shows how the American continents are slowing moving
away from African and Eurasian continents.
A. True
B. False
Which greenhouse gas is produced by commercial refrigeration and air conditioning systems?
PLESE HURRAHHY IM TIMED :(
carbon dioxide
fluorinated gas
nitrous oxide
methane
Answer:
fluorinated gas
Explanation:
Which greenhouse gas is produced by commercial refrigeration and air conditioning systems? carbon dioxide fluorinated gas nitrous oxide methane
✓ fluorinated gas
What explains two green pea pod plants producing 25% plants with yellow
pea pods? (green is dominant, yellow is recessive)
Answer:
two heterozygous pairs
Explanation:
the genotype products of Gy and Gy would be GG, Gy, Gy, and yy, making a 25% chance for yellow
The heterozygous pairs are those that have different alleles in the two chromosomes a and a re a set of the dipole individual.
The 2 green pea pod plants produce 25% of the yellow sea pods where the green is the dominate and yellow is recessive. As the chromosome is inherited in both the parent the gene is same. Thus the dominant green color and yellow pod plants will have a mix of genes.Learn more about the green pea pod plants producing 25% plants.
brainly.com/question/20817974.
7
1 point
In snapdragon flowers, the combined expression of red and white alleles for flower color produces a third phenotype that is pink. This illustrates incomplete
dominance. Which of the following would be the correct product from a cross between two heterozygous pink snapdragons?
Red
Pink
(RR)
(RW)
R R
R w
1
w (RW) (RW)
White
Pink
R
(RW)
w
2.
(ww)
w (RW)
(RW)
3
All pink flowers
?
1 red, 2 pink, 1 white
4
2 red, 2 white
ОООО
5
2 red, 1 pink, 1 white
1 red, 1 pink, 2 white
What are some of the causes that disrupt the natural balance of the ecosystem?
ridding the soil of decomposers
removing predators by hunting
overpopulation of predators
breeding hybrid plants
removing prey by transplantation
Answer:
All of them would cause disruptions in the natural balance of the ecosystem.
Explanation:
If you can only choose one. I would probably choose removing predators by hunting or the overpopulation of predators.
Answer:
I believe that every answer except for the fourth one would disrupt the ecosystem.
Explanation:
Answer could be
A.)3/16
B.)9/16
C.)11/16
Or D.)13/16
why do birds have short necks? pls help :/
Most diving birds have (relatively) long necks and shorts legs, although their necks aren't as long as say herons, storks or egrets. Take the common loon for instance. Their necks can be up to half as long as their bodies but their legs are so short and set so far back that they are very awkward on land.
A little help please..?
Answer: True
Explanation: Hope this help :D
Work is done when you
A .you lift a book
B .you stand on the floor
C .you hold a box
D .you push against a wall
How does overexploitation of oceans illustrate the tragedy of the commons ?
Answer: most of the world's ocean area also lies outside the legal jurisdiction of any country, thus, much of it is an open-access resource, subject to overexploitation. mark brainliest
Explanation:
Field mustard is an annual plant that grows wild in many regions of the world. It has small yellow flowers and is pollinated by insects. Field mustard has to flower and produce seeds to give rise to the next generation. Southern California experienced a severe drought between 2000 and 2004. Plants that flowered earlier reproduced. Those that flowered later died without producing seeds. This led to more early-flowering field mustard plants. This change in population characteristics took only a few generations.
How do you think scientists discovered that the flowering time of the field mustard had changed?
I will mark you as brainliest!!!!!!!!!!
Answer:
Mustard adapts quickly to climate fluctuations
Explanation:
Instead, the post-drought seeds gave rise to plants that flowered earlier than those of the pre-drought seeds, even in the greenhouse, confirming that the shift in flowering time really was due to an underlying change in the plants' genetic program.
What would be an individual with a genotype of XY would be ?
A. not possible
B. a male
C. a dwarf
D. a female
is mayonnaise real? I heard about it on twitter :/
Answer:
Real question is: is mayonnaise an instrument?!
Explanation:
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Which of the following is correct about mutations and genetic variation?
It must be present in a population before natural selection can act upon the population.
It arises in response to changes in the environment.
It tends to be reduced when diploid organisms produce gametes and reproduce.
It is created by the direct action of natural selection.
Answer:
a. It must be present in a population before natural selection can act upon the population.
Explanation:
Genetic variation is the difference in the DNA sequences in individuals, which makes a member of a species different from another member of the same species. It can also be said to be the differences in the genetic make up of individuals of a species population.
Genetic variation must be present in a species population before evolutionary mechanisms, such as evolution, can occur. Genetic variation must be present in a population of a species before natural selection can act upon the population, as natural selection can only increase or reduce the frequency of alleles present in the species population already.
Genetic variation in a population of species is important for natural selection to occur.
The true statement is that; "genetic mutation must exist before natural selection can act on it."
What is natural selection?The term natural selection refers to the fact that traits that are more favorable to enable an organism to survive and reproduce tend to persist in the population.
These traits usually occur due to genetic mutations. In a population, genetic mutation must exist before natural selection can act on it.
Learn more about natural selection: https://brainly.com/question/9904853
When people eat shrimp, they first pull off an outer covering that in life provided protection to the animal. What is this structure?
Answer:
carapace
Explanation:
the shell which protect the cephalothorax is called the carapace
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Answer:
c. 1 carbon, 4 hydrogen, and 2 oxygen
Explanation:
The development by scientists of a new color in a rose is the result of
O natural selection
artificial selection
descent with modification
O overproduction
Answer:
Artificial selection.
Explanation:
The development by scientists of a new color in a rose is the result of artificial selection.
At which of the following locations in the stream was there most likely a discharge of excess organic
matter into the water?
Answer:
D
Explanation:
Answer:
its actually B not D
Explanation:
How does the process of meiosis reduce the number of chromosomes in reproductive cells?
Explain why the BREATHING RATE of students increased after exercise. Include information about what happens at the level of body systems and at the cell.
Explain why the HEART RATE of the students increased after exercise. Include information about what happens at the level of body systems and at the cell.
Answer:
When exercising, your body uses more oxygen and produces more carbon dioxide and your muscles also need energy to contract because of this your breathing needs to increase.
Hope this helps :D
Answer:
for why the heart rate increase is because during exercise alot energy is used which means alot of oxygen also used for respiration ,the cells need oxygen to meet the demand of energy so breathing rate increase then to transport oxygen faster then the heart rate also increases.