I think it would be C. observe the cell with an electron microscope. but im am not a 100% sure.
Answer:
B
Explanation:
Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
Cells divide for growth, to repair tissue damage, and because the nucleus can only control a certain size of cell.
