Examlex
In the theory of demographic transition, the two variables on which the theory is based are ________ and ________.
Traits
Characteristic features or qualities that define an individual or species.
Dizygotic (DZ) Twins
Twins that derive from two zygotes; fraternal twins.
Mitosis
The form of cell division in which each chromosome splits lengthwise to double in number. Half of each chromosome combines with chemicals to retake its original form and then moves to the new cell.
Sperm
Male reproductive cells that carry a man's DNA and are necessary for the fertilization of a female's egg.
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