Examlex
Mental age is a measure of mental development expressed in terms of the average mental ability at a given age.
Umbilical Cord
A flexible cord-like structure containing blood vessels, connecting the fetus to the placenta during pregnancy.
Allantois
An embryonic membrane in reptiles, birds, and mammals that is involved in respiration and excretion.
Fertilization
The process of a sperm cell joining with an ovum (egg cell) to form a zygote, initiating the development of a new organism.
Cleavage
The division of cells in the early embryo following fertilization, leading to the formation of a multicellular organism.
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