A zygote is a single-celled organism resulting from a fertilized egg.
An embryo on other hand is the early stage of development of a multicellular organism.
Organisms that reproduce se- xually, embryonic development is the part of the life cycle that begins just after fertilization and continues through the formation of body structures, such as tissues and organs.
An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization
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