Since a secondary source is a source written after an event has occurred, I want to say that the answer is A. Hope this helped!<span />
Earth changes all the time, making it a <u>dynamic </u>planet.
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Answer:
It is essential for all living things. Fixation: In order for organisms to use atmospheric nitrogen (N2), it must be “fixed” or converted into ammonia (NH3).
Explanation:
