Which of the following would be a reason for a spcies to undergo cyclic population changes? a. the keystone species in the ecosystem is removed b. the vegetation it eats increases and then decreases repeatedly with changing seasons c. its predator is preyed upon by a new species introduced to the ecosystem d. climate change alters the prevalence of parasites that affect the species

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.