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(also called the pith) the central part of the stem that consists of large, thin-walled...

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the part of the hindbrain that controls autonomic functions such as breathing, digestion, heart...

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(also called pith rays) sections of the medulla that occur between the vascular bundles.

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a type of nuclear division during which reproductive cells divide to produce gametes. The...

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cells that remember specific antigens.

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