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

True
Sperm whales, baleen and other related species are just an example of these organisms that maintain their population close to carrying capacity. This is because of their adaptive mechanisms to survive and propagate their offspring at a sure rate. Ocean is a vast ecosystem that have major predators and a competitive environment. 

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Ithink its false. hope this : )