Your immune systems main function is? A. Takes in oxygen and removes carbon dioxide and water

B. Allows organisms to reproduce preventing their species from becoming extinct

C. Fights off foreign invader

D. Transport materials to and from cells

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.

Which of the following is a common response to cell signaling?