Antibodies are produced by the immune system to fight off many viral infections. they are special types of which structure?
a. agents
b. cells
c. proteins
d. vaccines

What are the components of an effective weight-training program? a. conditioning, progression, generalization, overwork, balance, and recovery b. overload, progression, specificity, regularity, recovery, balance, and variety c. overwork, coordination, motivation, conditioning, regularity, and variety d. consistency, progression, rest, regression, balance, and specificity