The answer is C. The distribution of traits in a population
Answer:
The independent variable is "controlled" or held constant in the control group.
Explanation:
Answer:
glacial till
Explanation:
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A. Consumers cannot produce their own food source so they have to eat other animals.
C. Rhizobia bacteria "prepare" the atmospheric nitrogen and make it useful for the plant.
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The two substances that scientists use are
carbon-14 and carbon-12
