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meristem that produces a layer of bark on the outer surface of a plant.

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blood vessel that supplies the heart muscle with blood.

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disease caused when the arteries that supply the heart muscle become narrowed or blocked by the...

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the broad band of tissue in plant organs under the epidermis, including the parenchyma cells and...

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refers to an animal that is active during twilight i.e. at dawn and dusk.

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