Which of the statements below are true? choose all that apply.

a. insects are rarely important to the health of forest ecosystems.
b. people's activities can improve the health of an ecosystem.
c. people's activities have no measurable effect on ecosystems.
d. plants produce food for ecosystems.
e. predators keep ecosystems healthy.

A is not correct. Insects helps animals live. I think B is correct because people can plant trees. People can also cut down trees which hurts the ecosystem. C is not correct. There is a lot of deforestation already that's very noticeable. D is correct. Plants help animals live by giving them food. E is correct. The predators eat prey. This keeps the ecosystem from getting too much of one animal. Hope this helps! ;)