Which observation proves that a cell is a eukaryote
a. the cell uses ribosomes to create protein
b. the cell contains dna
c. the cell contains nucleus
d. the cell has a cell membrane?

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.

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.

The image below shows a weather service map. which details best describe this map? check all that apply