Why is sunlight included in the equation

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

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.

Contrast how pollination is different among gymnosperms and angiosperms.