Careful observers of nature realized early on that most animals have relative constant breeding population sizes. According to Dr. Colinvaux what is the major reason for that? a) Suitable breeding habitat is limiting and does not change much and therefore define the size of the breeding population
b) Even though populations grow in size after the breeding season due to the many young joining the populations, many die during the adverse season (cold winter, dry seasons, etc.)
c) Predators will keep the size of the breeding population constant by removing surplus individuals
d) Species know their "K" and will reduce the number of offspring when the population grow too much