Question

fill in the blanks:
__________ is recycled through an ecosystem. it cannot be created or destroyed.
__________ flows one way through an ecosystem. it must constantly be replenished.
matter, energy
water, food
food, water
energy, matter

Explanation:

In an ecosystem, matter follows the law of conservation and is recycled. Energy, however, flows in one - way, like from the sun to producers and then through different trophic levels, and needs continuous replenishment.

Answer:

A. Matter, Energy