Coleoptera: what proportion of animal species alive today are members of this group?

Coleoptera is the largest order in existence. The order is made up of about 400,000 species, which represents about 40% of all described insects and approximately 25% of all known animal life forms. New species of coleoptera are also discovered frequently. Thus, Celeoptera is about 25% of all animal species alive today.

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.