Active transport is a cellular transport mechanism. It’s the movement of molecules that are assisted by enzymes along the way to a higher concentration.
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I'm going to go with a mixture sorry If this is wrong
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The plant is photosynthesizing and using up the CO2.
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Living things are highly organized and structured, following a hierarchy that can be examined on a scale from small to large. The atom is the smallest and most fundamental unit of matter. ... A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds.
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