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andreyandreev [35.5K]
3 years ago
5

Darwin’s finches evolved on an island. What is the main reason that islands often provide good examples of evolution?

Biology
2 answers:
Gnesinka [82]3 years ago
6 0
Islands are isolated
uysha [10]3 years ago
3 0

Answer:

They allow for automatic biogeographic isolation. In rock layers, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are found lower than ammonite fossils.

Explanation:

(found it on quizlet feel free to rewrite in you own words)

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In an experiment two potted plants, labeled Plant 1 and Plant 2, are placed in transparent plastic bags and left in the open. So
Sloan [31]

Answer:

Its D. role of carbon dioxide in photosynthesis.

Explanation:

I know its right bc I just got that question.

7 0
3 years ago
The scientific method provides the framework for all scientific research, including nutrition science. Choose the statement belo
Andrews [41]

Answer:

1) d. observe phenomenon; generate hypothesis, conduct experiment, accept, reject, or modify hypothesis.

C. A study that compares a aroup of people with diabetes to a similar aroup of people without diabetes is an example of a case-control study.

Explanation:

Scientific method is a step by step procedure ranging from observing a problem to actual experimentation that aims at investigating a problem. The steps involved in the scientific method are as follows:

a)observe phenomenon; This precedes every experiment in the scientific method.

b) generate hypothesis: This is a testable explanation given as a possible solution to the observed problem.

c) conduct experiment: The hypothesis is tested via experimentation.

d) accept, reject, or modify hypothesis: Based on the result of the experiment, the hypothesis can be rejected, accepted or even modified.

Question 2:

Case control study is a type of study design that uses or compares a group of affected individuals (by a disease) called CASES and unaffected individuals called CONTROL. In this case, A study that compares a group of people with diabetes (cases) to a similar aroup of people without diabetes (control) is an example of a case-control study.

7 0
3 years ago
Can someone help me with these
prisoha [69]
The answer is B. hope you get it

8 0
3 years ago
If you were trying to build a soundproof room, which of the following materials would you choose in order to absorb the most sou
gulaghasi [49]

Coefficients of Absorption for Common Materials

Perforated acoustic ceiling material 60%

Heavy curtains 50%

Carpeting 20%

Wood 5%

Plaster 3%

Clay tile 3%

Concrete 2%

The answer is C. Heavy curtains

7 0
3 years ago
What is the basic difference in effector function between helper and cytotoxic T cells?
3241004551 [841]

Answer:

Helper T cells stimulate B-cells to produce antibodies and killer T cells to destroy the non-self cells. Cytotoxic T cells on the other hand are direct attack cells. They can kill the micro organisms by creating pores on the invader's cell.

Explanation:

T lymphocyte mediated immunity of cell mediated immunity do not secrete antibodies but they help stimulate the B cells to produce them. Immature T cells are produced in bone marrow from where they migrate to thymus via blood. In the thymus maturation of T cells occur and then they migrate to lymphoid tissue and get differentiated into three types:

a. Helper T cells: As the name suggests, they help in activating other immune cells, in other terms they are the regulator of virtually all functions of immune system. Protein mediator called lymphokines are produced by these helper T cells in order to regulate the immune functions. Some examples of these lymphokines are: Interleukin-2 interleukin-3, interferon gamma. T helper cells stimulate the B-cells to produce antibodies.

b. Cytotoxic cells or killer T cells: The lymphokine interleukin-2 is responsible for the growth and proliferation of both cytotoxic T cells and suppressor T cells. With the help of receptor proteins on the surface of killer T cells, they bind to the specific antigen. After binding, they secrete a pore forming protein called perforins which create pores on the invaders cell membrane for water to enter into it thereby cell swells and finally lyse.

c. Suppressor T cells: They suppress the function of above two T cells.

5 0
3 years ago
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