Examlex
An astronomer plots the intensity of the radiation emitted from an opaque object at a certain temperature versus its wavelength. As the object's temperature increases, the total amount of energy emitted all across the spectrum increases as the fourth power of the temperature. This is an illustration of
Embryonic Stage
A critical phase of prenatal development that spans from implantation of the zygote in the uterine wall through the eighth week, where major organs and structures begin to form.
Zygote
A fertilized ovum (egg cell).
Uterine Wall
The muscular wall of the uterus, which thickens during the menstrual cycle and pregnancy, playing a key role in pregnancy and childbirth.
Fetus
A developing mammal or human from the ninth week after conception until birth.
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