This is a system of organisms or things ranked one above another

This is a system of organisms or things ranked one above another

Genus

Explanation:

the usual major subdivision of a family or subfamily in the classification of organisms, usually consisting of more than one species.

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--Jay

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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a physical change is being made.