Answer:
In an ecosystem, what happens to the atoms of certain chemical elements, such as carbon, oxygen, and nitrogen? They move into and out of living systems. process in which chemical energy is used to produce carbohydrates. ... single-essential nutrient that limits productivity in an ecosystem.
Explanation:
I believe the answer is B, although A has as well a very good chance of being correct. But B does support evidence with the chemicals found inside them.