Unlike the female reproductive system, the male reproductive system a. produces eggs. b. is affected by hormones. c. utilizes a menstrual cycle, which is nearly 28 days long. d. is fully functional and able to produce and release active sperm after puberty. mark for review (will be highlighted on the review page)

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper