Examlex
The beta decay of cesium- 137 has a half- life of 30 years. How many years must pass to reduce a 25 mg sample of cesium 137 to 8.7 mg?
Embryonic Stage
A critical period in prenatal development covering the first 8 weeks after fertilization, when the basic structures of the organism begin to form.
Post-Natal Stage
The period following childbirth, focusing on the mother's recovery and the baby's adaptation to life outside the womb.
Embryonic
Referring to an early developmental stage in animals and plants; in humans, it covers the first eight weeks after fertilization.
Foetal
Pertaining to a fetus, the developmental stage of a vertebrate occurring in the womb before birth.
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