an earthworm has a heart that moves blood.

what is the main function of this organ?

a. to take in oxygen and remove carbon dioxide

b. to take in and digest food

c. to transport materials to and from body cells

d. to respond to the environment

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.

Where in the cell are ribosomes made?

Organize the word parts according to where they appear in a medical term.