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Subject:

the outer most layer of tightly packed modified parenchyma cells in plants.

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the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...

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tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.

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epithelial tissue that lines the inner spaces of the body or organs.

era
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a very long time span in the Earth's history, covering tens or hundreds of millions of years....

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