Fluctuations in the phosphorus cycle in aquatic ecosystems
a. can lead to changes in the growth rates of aquatic populations
b. are never caused by human impact on the environment
c. lead to a decrease in the amount of phosphorus found in sediment
d. never occur naturally

The correct answer is a. can lead to changes in the growth rates of aquatic populations. It can affect all types of growth, both in population and in the size of units. Also, it can completely prevent them from growing in numbers and if there's too much of it there can be pollution and other organisms can feed on it and destroy the habitat for most organisms found in them.

No that answer is wrong. you have written the function of mitochondria in chloroplast and function of chloroplast in mitochondria.

They both determine the exact age of rocks.