Which of these is an organ?
a) blood cells
b) the stomach
c) connective tissue
d) the respiratory system

Abnormal softening of a gland is known as

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.

49 ! how are energy cycles and growth cycles related?