DNA is copied during replication.
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The most prevalent source of agricultural water pollution is soil that is washed off fields. Rain water carries soil particles (sediment) and dumps them into nearby lakes or streams. Too much sediment can cloud the water, reducing the amount of sunlight that reaches aquatic plants
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ribose is a major component of the energy molecule known as ATP (adenosine triphosphate).
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For an instance, an aquatic food web can be connected to a food web that is based on land. Planktons and algae are some of the main producers which are found in the marine ecosystem. These planktons are eaten by a tiny shrimp called krill. Whales, seals, squids and fishes feed on these tiny shrimps.
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An organelle is a subcellular structure that has one or more specific jobs to perform in the cell, much like an organ does in the body. Among the more important cell organelles are the nuclei, which store genetic information; mitochondria, which produce chemical energy; and ribosomes