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Active transport
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The movement of materials across a cell membrane using cellular energy.
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Carbohydrate
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A energy-rich organic compound, such as a sugar or a starch, that is made of the elements carbon, hydrogen, and oxygen.
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Cell
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The basic unit of structure and function in living things.
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Cell membrane
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A thin, flexible baerrier that surrounds a cell and controls which substances pass into and out of a cell
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Cell theory
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A widely accepted explination of the relationship between cells and living things
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Cell wall
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A rigid supporting layer that surrounds the cells of plants and some other organisms.
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Chloroplast
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A organelle in the cells of plants and some other organisms that captures energy from sunlight abd changes it to an energy form that cells can use in making food.
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Compound
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A substa
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