Put the levels of the pet aid with the LARGEST level at the bottom .

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it