Answer: Presence of predators.
Explanation: predators such as hyenas or wolves would keep the here at a particular level so that they don't exhaust the primary producers which is the grass.
Answer:
Stimulus.
Explanation:
A stimulus causes an action or response. For example, a stimulus can be something that causes a reaction in an organ or cell.
Answer:10,000 kcal
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A. This is called a bottleneck
B. 36 thymine