The Evolutionary Mode in Which Species Evolve Rapidly at First

question 69

Multiple Choice

The evolutionary mode in which species evolve rapidly at first and then remain stable for very long periods of time is called ____.

• A) catastrophism
• B) uniformitarianism
• C) disruptive selection
• D) punctuated equilibrium
• E) phyletic gradualism

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Definitions:

Spermicide

A contraceptive substance that destroys sperm, used alone or with other forms of birth control to prevent pregnancy.

Seminiferous Tubules

Narrow, coiled tubules within the testes where spermatogenesis, the production of sperm cells, occurs.

Spermatozoa

Male reproductive cells, or sperm, responsible for fertilizing the female ovum.

Cryptorchidism

A condition where one or both of the testes fail to descend from the abdomen into the scrotum in male infants.