Describe the properties of alkaline earth metals. Based on their electronic arrangement, explain whether they can exist alone in nature.

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explanation:

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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.