Answer:
A stem is the root or roots of a word, together with any derivational affixes, to which inflectional affixes are added. Discussion: A stem consists minimally of a root, but may be analyzable into a root plus derivational morphemes. ... The verbs tie and untie are both stems.
Where are your scratch tests? The question cannot be answered without having them to look at.
Competition requires instant succession within organism but parasitism can still be a gradual process due to its types exo and endo
THE ANSWER IS COMPETITION
This would be enzymes made of proteins.
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