A forester is studying a woodlot near Winter Park. She finds that there are 500 aspen trees in the 12
km by 13 km area she is studying. What is the
population density of the aspens?

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