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.

Question

Quizplus · Accepted Answer

The slow and subtle changes seen in the sequence of horse fossils align with the gradual model of speciation. Additionally, the presence of transitional forms supports the idea of gradualism.

One of the Finest Available Sequences of Fossils Shows How