Astudent observes a worm-like organism crawling about on dead organic matter. later, the organism sheds its outer covering. one possibility is that the organism is a larval insect (like a maggot). on the other hand, it might be a member of which phylum, and one way to distinguish between the two possibilities is by looking for the presence of

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the scientific method.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.