One of the Finest Available Sequences of Fossils Shows How

question 19

Multiple Choice

One of the finest available sequences of fossils shows how horses have changed slowly and by subtle steps from small, shrub-browsing ancestors to the large, grass-grazing modern horse. A large number of fossil species have been named, and it is often difficult to decide on the identity of a fossil horse because transitional forms are common. This record of evolution best fits the idea of

• A) the gradual model of speciation.
• B) punctuated equilibrium.
• C) adaptive radiation.
• D) hybrid breakdown.

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Definitions:

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Lifestyle

The way in which a person or group lives, including patterns of social relations, consumption, entertainment, and dress.

Gerontologists

Scientists or practitioners who specialize in the study of aging and the health, well-being, and social issues affecting older adults.

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Living for an extended period, often beyond the average lifespan for a species or demographic group.