Answer:
T cells identify pathogens based on antigens on the surface of pathogens. The T cells then multiply and stimulate B cells to produce antibodies. The antibodies attach to the antigens, making the pathogens a target for phagocytes.
Explanation:
i think b and c. but not sure what the third is? only 70% sure.
Answer: the atoms are istopes
probably A but I'm not sure about it