What do all wetlands have in common?

a. they are swamps.
b. they lack life-forms.
c. they are highly polluted.
d. they recycle nutrients into the soil.

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.