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The embryonic stage of gestation is the period after implantation, during which all the major organs and structures within the growing mammal are formed. Once the embryo is fully formed, it expands, grows, and continues to develop in what is known as the fetal development stage.
The initial stages of a multicellular organism's development. In sexually reproducing mammals, embryonic development begins as soon as the male sperm cell fertilizes the female egg cell. The zygote, which is made up of these two cells together, divides repeatedly to produce blastomere cells. The blastocoel, a hollow structure made of fluid that eventually fills the solid ball-shaped morula that make up the blastomeres. The object is subsequently referred to as a blastula or, in the case of animals, a blastocyst.
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