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An embryo is an animal or a plant in its earliest stage of development.

1 Plants

In botany, a plant embryo is part of a seed, consisting of precursor tissues for the leaves, stem (see hypocotyl), and root (see radicle), as well as one or more cotyledons. Once the embryo begins to germinate — grow out from the seed — it is called a seedling.

2 Animals

The embryo of vertebrates is defined as the stages between the first division of the zygote (a fertilized ovum) until it becomes a fetus. An embryo is called a fetus at a more advanced stage of development and up until birthChildbirth (also called labour birth or parturition is the culmination of pregnancy, the emergence of a child from its mother's uterus. It can be considered the opposite of death, as it is the beginning of a person's life. Age is defined relative to this or hatching. In humans, this is from the eighth week after outward

2.1 Stages

See also : in vitro fertilization -- embryologyEmbryology is the science of the early development of organisms, between the one-cell stage (generally, the zygote) and the beginning of free living. Embryology therefore deals with the various steps necessary for the correct and complete formation of the

3 External links

• chart of human development