Read the following paragraph from the section "What Influences Fertility?" In the past, fertility rates of 4.5 to seven children per woman were common. High mortality rates of young people kept population growth low. As health care and medicine improved, the population growth rate began to soar. It only flattened out as the fertility rate declined toward two children per woman.
How does this paragraph support the MAIN idea of the article?

The answers no

No that answer is wrong. you have written the function of mitochondria in chloroplast and function of chloroplast in mitochondria.

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.