Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 23

embryo - Description, Growth of the Human Embryo

fertilized egg ovum contained

In flowering plants, the young plant developed from an ovum and contained within the seed; in animals, the developing young, typically derived from a sexually fertilized ovum, contained either within the egg membranes or inside the maternal body. The embryonic phase commences with the division of the fertilized egg (zygote), and ends with the hatching or birth of the young animal.

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