The answer is going to be b. hope that helped
Answer:
no
Explanation:
you would need an electron microscope to see atoms.
9,000 meters
Because density is altered by altitude, the helium balloon can reach a height of 9,000 meters, or 29,537 feet. Anything higher than this altitude will cause the helium within the balloon to expand and the balloon to pop.
The cell walls are different, plant cells require more rigidity. that's all I know
Cause they can give an estimate how much it weights