​With the Extinction of the Dinosaurs 65 Million Years Ago

question 87

Multiple Choice

​With the extinction of the dinosaurs 65 million years ago, multiple niches that the dinosaurs once filled opened up and allowed mammals the opportunity to evolve and exploit those niches. This is an example of ____.

• A) ​sympatric speciation
• B) ​adaptive radiation
• C) ​phylogeny
• D) ​reproductive isolation
• E) ​phylogenetic isolation

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Definitions:

Tolerance

The process by which an individual's physiological response to a substance decreases with repeated use, necessitating larger amounts to achieve the same effect.

Increased Amounts

Refers to a quantity or volume of something becoming larger or greater than before.

Depressant

A substance that reduces arousal and stimulation in the brain, often used to treat anxiety and insomnias, such as alcohol or sedative medications.

Initial Effect

Describes the immediate impact or outcome of an event or substance on an individual or system.