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There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.
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Fill in the blank with the correct sphere label. a: ā geosphere b: ā biosphere c: ā hydrosphere
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What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water
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In eukaryotic cells, proteins are made at the ribosomes. what other organelles are involved in this...
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