Which of these is an abiotic factor?

The process that is almost the reverse of photosynthesis is ___.

Where would you find organisms that produce food by chemosynthesis?

Grass uses photosynthesis to produce ___.

Nonliving physical features of the environment are called ___.

One possible result of extra carbon dioxide in the atmosphere is ___.

DNA in organisms is formed by ___.

Which of these organisms is the first step in a food chain?

Features of the environment that are alive now or once were alive are called ___.

Which of these can add nitrogen to the soil?

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