In any ecosystem, the size of a population
a. may change over time.
b. only depends on the population's reproductive rate.
c. always stays the same.
d. only depends on the amount of resources available.

Option (A) is the correct answer.

Explanation:

A community where living organisms live and they create their own physical environment is known as an ecosystem.

The total living organisms of that community represents the population of ecosystem.

This population changes with change in time.

Hence, we can conclude that in any ecosystem, the size of a population may change over time.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!