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AlladinOne [14]
3 years ago
8

This is a species whose presence is critical to the composition and integrity of the community.

Biology
2 answers:
Delicious77 [7]3 years ago
8 0

Keystone species ; this is a species whose presence is critical to the composition and integrity of the community


DENIUS [597]3 years ago
6 0

Answer:

Keystone species

Explanation:

A Keystone species is the one whose presence regulates the species composition and functioning of the ecosystem. These species are mostly present in less number but have profound effect on the ecosystem.

Example:  Saguaro cactus is keystone species of desert. It produces large number of fruits in hottest period of summer. Hence it provides food and shelter to other desert species such as rats and snake.

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A student wants to know what effect temperature will have on the germination rate of radish seeds.  To test this, she obtains 3
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Answer:

Hypothesis: IF the temperature is high, THEN the germination rate of radish seeds will increase.

Experimental Group: 20 Seeds in petri-dishes placed in the freezer and incubator each

Control Group: 20 seeds stored at room temperature

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Responding Variable (DV): GERMINATION RATE

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Explanation:

- The hypothesis is a testable explanation given to an observed problem. A possible hypothesis is IF the temperature is high, THEN the germination rate of radish seeds will increase.

- Independent or manipulated variable is the variable that is changed or manipulated variable in an experiment. The TEMPERATURE is the independent variable in this case.

- Dependent or responding variable is the variable that is measured in an experiment. In this case, the dependent variable is the GERMINATION RATE

- The experimental group is the group that receives the experimental treatment. In this case, the experimental group is the 20 Seeds in petri-dishes placed in the freezer and incubator each.

- The control group is the group that does not receive the experimental group. In this case, the control group is the 20 seeds stored or placed at room temperature.

- Constants are the variables that are kept unchanged throughout the experiment. In this case, the constants are Amount of water, same amount of time (2 weeks)

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