What is embryo?

An embryo is the early stage of development of a living organism after fertilization and before it becomes a fetus.

In humans and most animals:

• The embryo forms when a sperm fertilizes an egg, creating a single cell called a zygote.
• This zygote divides and develops into an embryo.
• In humans, the embryo stage lasts up to 8 weeks after fertilization.
• After 8 weeks, it is called a fetus.