Scientists use various methods to date stone. Explain why stone tools are dated using the age of the rock in which they were found, and not the age of the stone from which the tool was made.

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