Why is dna important to the growth and development of a multi-cellular organism

DNA is important to the growth and development of a multi-cellular organism for it to replicate and pass on the genes. Through it, a new copy of organism's genetic information is formed. The process of the DNA replication is known as cell division wherein the mother cell creates new daughter cells.

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.