Which of these describes a population? all the gray squirrels that live in a forest an area characterized by a group of plants and animals a nonliving factor in an organism's environment

all the gray squirrels that live in a forest.

Explanation:

Population is determined by taking the statistics of a particular organism living and reproducing in a particular area. There are different ways of measuring the population size and density of organisms.

Population density is commonly measured using three different ways - physiological density, arithmetic density and agricultural density.

Therefore, 'all the gray squirrels that live in a forest' best describes a population because it has been determined through population density of a particular area.