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Proper motion is the motion
Lanugo
Fine, soft hair that covers the body of a fetus, which is usually shed before birth.
Cleavage
A process of cell division in the early embryonic stage that leads to the formation of a multicellular embryo.
Morula
An early stage in embryonic development that follows fertilization, featuring a solid ball of cells resulting from the division of a zygote.
Gametogenesis
The process by which gametes, or sex cells, are formed, involving meiosis and maturation in reproductive organs.
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