Give 4 examples of metabolic reactions

What must be true for natural selection to heppen

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.

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?