Life requires energy. in a short essay (100–150 words), describe the basic principles of bioenergetics in an animal cell. how is the flow and transformation of energy different in a photosynthesizing cell? include the role of atp and enzymes in your discussion.

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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layer 3 is younger than layer 6.