Examlex
Initially there are 6000 nuclei of an isotope with a half-life of 3 hours. How many nuclei of that isotope will be left after 12 hours?
Chorion
A membrane that surrounds the amnion and becomes the fetal component of the placenta.
Epigenesis
The process by which a new phenotypic form emerges through the interactions of the preceding form and its current environment.
Zygote
The earliest developmental stage of an embryo, formed when a sperm cell fertilizes an egg cell, which then begins to divide and grow.
Germinal Period
The initial two weeks of prenatal development following conception, characterized by rapid cell division and the beginning of cell differentiation.
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