All retroviruses produce an enzyme called reverse transcriptase, which permits them to insert copies of their own genetic material into that of the cells they have infected

There are approximately how many skeletal muscles in the human body?

A) 420 B) 400 C) 606 D) 700

A function of the lymphatic system is to:

a. break down food. b. return interstitial fluid to the blood. c. control organ systems via hormones. d. move blood containing nutrients.