simple epithelial tissue

isotopes

Subject:

two or more forms of a particular chemical element, that have the same number of protons in the...

Subject:

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

mucus

Subject:

a watery fluid secreted into the alimentary canal.

embryo

Subject:

in plants: the structure within a seed that will develop into the new plant.

Subject:

an autoimmune disease which is treated with insulin injections.

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