How do plants obtain nitrogen? a. they remove it from the air b. they absorb it from their roots. c. they fix their leaves. d. they produce it in their stems

Plants take in nitrogen from the soil by absorption. So option B.
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Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.