Why is photosynthesis broken down into two separate steps/stages?

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 of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

In which part of the body is a ball-and-socket joint found?