Examlex
Opportunity cost is the value of the next-best alternative that is given up as a result of making a particular choice.
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.
Implantation
The process by which a fertilized egg attaches to the lining of the uterus to begin pregnancy.
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