1. Many species of field mice can reproduce several times a year and produce
litters with multiple offspring. However, an ecologist noted that the population size
of mice in a California grassland remains stable from year to year. The factors that
keep natural populations from increasing are collectively called
A. X-factor.
O B. limiting factors.
O C. carrying capacity.
O D. birth, death, immigration, and emigration.

limiting factors determine a habitat's carrying capacity. hence the factor that keep natural population from increasing are collectively called limiting factors. Thus option B is correct.

What do you mean by carrying capacity of a species ?

In an ecosystem the number of organism can survive successfully under certain resources referred as carrying capacity.

If a species population exceeds the environment's carrying capacity, the population depletes due to less availability of resources.

Several factors influence an environment include availability of food which is paramount for the survival of a species.

Water is the another essential factor which help animal in food digestion, regulate body temperature and elimination of waste products.

Ecological Conditions of an environment have an effect on carrying capacity of environment.

Space is another factor that provide a shelter to animals for survival and reproduction.

Thus option B is correct.

Learn more about carrying capacity, here:

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