Examlex
You can hear sound through an open window from sources that are not in your line of sight because of diffraction.
Embryo
The first eight weeks of development after fertilization.
Infant
A very young child, especially one newly or recently born, usually considered to be from birth to 1 year old.
Zygote
A cell produced by the union of an ovum and a sperm.
Fetus
A developing human from roughly eight weeks after conception to the moment of birth.
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