At what stage the embryo called foetus and what is embryo,foetus

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There are three stages: zygote comes first then the embryo is formed and finally before birth, it is called fetus.
When sperm meets the ovum fertilization occurs which results in the formation of the fertilized egg called zygote. Zygote starts dividing to form solid ball of cells called blastocyst while moving from fallopian tube to uterus. When blastocyst gets implanted into the walls of the uterus it becomes an embryo. The stage between the formation of embryo till birth is called the fetus.

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Embryo is a ball of cells which indicates the first stage of development of the zygote formed by fertillization of male and female gametes. Cells in this embryo divides to form the baby. When the outer structure of the baby developing inside can be identified, then this stage of the developing baby is called foetus.
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When the outer structure of the baby developing inside can be identified then this stage of the developing baby is called foetus.
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