Glossary of Biological Terms

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Y

yeast

A unicellular fungus that lives in liquid or moist habitats, primarily reproducing asexually by simple cell division or by budding of a parent cell.

yolk

The stored food in egg cells that nourishes the embryo.

yolk sac

One of four extraembryonic membranes that supports embryonic development; the first site of blood cells and circulatory system function.

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