Options:
A). coral growth.
B). plant reproduction.
C). humans.
D). biodiversity.
E). important habitats.
F). coral reefs.
G). genetic diversity.
H). moss growth.

Fact 1: Planting trees has a positive impact on an ecosystem. Fact 2: Biodiversity encourages a healthier ecosystem. Given the two facts above, what does planting trees have a positive impact on?
Answer:
D).