Q: Unlike energy, what doesn’t need to be constantly added to ecosystems because it is recycled through ecosystems?


Read this paragraph and choose the correct option from the provided answers:

Unlike energy, matter doesn’t need to be constantly added to ecosystems. Instead, matter is recycled through ecosystems. Water and elements such as carbon and nitrogen that living things need are used over and over again.

 Choices:

- water

- nutrients

- vapor

- matter


A:
matter