Which of these minerals and mineral resources is composed of the remains of plants that lived and died millions of years ago? a. coal b. aluminum c. salt d. petroleum

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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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.