Is a buckbrush abiotic or biotic?

A buckbrush is biotic, beacuse biotic relating to or resulting from living things, especially in their ecological relations.

Explanation:

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the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.