Glossary

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mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...

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those species that are found only in a particular area or region and nowhere else on Earth.

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a ductless gland that secretes hormones directly into the bloodstream, to be transported to...

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the inner body tissue layer that forms the gut and other internal organs.

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the inner most layer of the cortex of roots and some stems of plants.

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