Which of the following contains organ systems? Choose 1

organism
tissues
cell
organ

Organism

Explanation:

The other options are all smaller than an organ system.

A cell is the smallest. Many cells make a tissue, many tissues form an organ and many organs form an organ system. Many organ systems form the organism :))

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

human didn't come from monkeys man i hate these stupid teachers