Examlex
Freud emphasized that the ego operates on the ________ principle.
Genetic Variation
The diversity in gene frequencies within a population, which contributes to the population's ability to adapt and evolve.
Adaptive Radiation
The rapid evolution of diversely adapted species from a common ancestor when introduced into new environmental circumstances.
Balanced Polymorphism
A situation in genetics where two or more alleles of a gene persist in a population because they each offer a survival advantage.
Sister Groups
Groups of organisms that share an immediate common ancestor, and therefore are each other's closest relatives.
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