What is the main idea of the third paragraph？
An ecosystem is a community that includes animals, plants, and microscopic bacteria.
B. Local ecosystems depend on each other, so human activity should be cautiously planned.
C. In managing the ecology of an area, we should use natural succession to our advantage.
D. People should remember that they are a part of the ecosystems where they live and work.
According to this author, after a forest fire, the first living things to reappear would be
A. algae
B. insects
C. mosses and ferns
D. forest animals
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