Final answer:
In ecosystems with low levels of nitrogen in the soil, carnivorous plants grow that capture insects for their nitrogen.
Step-by-step explanation:
In ecosystems with low levels of nitrogen in the soil, some plants have special adaptations to survive. Carnivorous plants such as the Venus flytrap and pitcher plants grow in areas where the soil is low in nitrogen.
These plants have leaves that are modified to capture and digest insects, which provide them with a supplementary source of nitrogen.
Therefore, option A, carnivorous plants grow that capture insects for their nitrogen, is the correct answer.