Organisms within communities and ecosystems feed on one another to obtain energy and nutrients. What component does not cycle within an ecosystem.

Living things cannot maintain their organization or carry on life's activities __________.

Which of the following is not an abiotic factor?

Which of the following two organisms are producers?

__________ are autotrophic organisms with the ability to carry on photosynthesis and to make food for themselves.

The following factors are abiotic, except __________.

What animal eats only other animals?

What organisms break down dead organisms to get energy?

The autotrops _____.

What is the original source of almost all the energy in most ecosystems?