What is one biotic factor that can change the size of a population in an ecosystem
a. the type of soil present
b. the number of predators present
c. the average yearly temperature
d. the amount of available groundwater
the answer is b. the number of predators present! i'm so

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You are correct. It would indeed be option B. the number of predators present.

(Note : 'biotic' means living organisms)

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[content deleted] - user123802726recklesschicken

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.