Which could be a reason viruses are considered nonliving things? viruses come from cells. viruses produce cells. viruses are made of dna and proteins, but not cells. viruses attack cells and are dangerous to them.

C is correct on Edge 2021

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.

the correct answer is:

a population changes in response to a change in the environment.