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In Selman's initial stage of perspective-taking, children appear unable to understand why someone would want to do something different than they want to do.
Sperm Cell
The male reproductive cell, which can fertilize an egg cell to initiate the development of a new organism.
Genetic Material
Molecules within living cells that carry genetic information, primarily DNA or RNA, which guide the development, functioning, and reproduction of organisms.
Monozygotic (MZ) Twins
Twins that derive from a single zygote that has split into two; identical twins. Each MZ twin carries the same genetic code.
Dizygotic (DZ) Twins
Twins that derive from two zygotes; fraternal twins.
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