What is a scientist called who ovserves animals in order to explain their behavior

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen

Which label identifies the part of the atp molecule that changes when energy is released in the cells of all living things