Examlex
How many phalanges are on each hand?
Amniotic Sac
A fluid-filled sac within the uterus that surrounds and protects a developing fetus during pregnancy.
Zygote
The initial cell formed when a new organism is produced by the fusion of sperm and egg cells, representing the earliest developmental stage.
Pupa
A developmental stage of some insects, occurring after the larva stage and before adulthood, during which the organism undergoes significant transformation.
Embryonic Stage
The phase of prenatal development that occurs from fertilization until the end of the eighth week, where major structures and organ systems begin to form.
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