Sperm whales, a(n) species, maintain their populations close to carrying capacity.
r-selected
k-selected

r-selected

Carry capacity is defined as the maximum population size of a species that an environment can sustain indefinitely. It is also defined as the environment's maximal load of a species. Factors that impact on the carrying capacity of a species are the availability of food and water, raw materials to build shelter, the environment's ability to process waste products, as well as the species' ability to reproduce. 

Nine months old i think but i’m not that sure