Examlex
A sidereal day is ______________ than a solar day.
Gametes
Reproductive cells (such as sperm and egg) with half the usual number of chromosomes, capable of fusing with another to form a new organism.
Placenta
A conduit between the mother and fetus, providing nourishment and oxygen via the umbilical cord.
Amniotic Sac
A fluid-filled sac that surrounds and protects the fetus in the womb, providing a safe environment for the fetus to grow and develop.
Ectoderm
The outermost layer of cells in the early embryo, which develops into the nervous system, skin, and hair.
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