The internal state of the body is best described as a(n) equilibrium, where there is a set average point and conditions fluctuate around that point.

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.

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above