Early Indus Valley Civilization ... their Geograhpy, their customs and Indo-Aryan civilization with the earliest caste system.
Antibodies contribute to immunity in three main ways: they can prevent pathogens from entering or damaging cells by binding to them; they can stimulate removal of a pathogen by macrophages and other cells by coating the pathogen; and they can trigger direct pathogen destruction by stimulating other immune responses such as the complement pathway.
B lymphocytes are the white blood cells that produce plasma cells  that produce antibodies. Antibodies are special proteins that  recognize foreign materials and help the boâ¦dy destroy or neutralize  them.    The type of white blood cell that secretes antibodies to kill  microorganisms is called lymphocytes.