Answer:
all the gray squirrels that live in a forest.
Step-by-step 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.