Embryo - An embryo is an early stage of development of a organism
Foetus - An unborn human more than eight weeks after conception
Neonate - A newborn Child or an infant less than four weeks old
Infants - The term "infant" is typically applied to young children under one year of age
Explanation:
An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg.
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