A trend first observed in the evolution of the earliest tetrapods was
A)the appearance of jaws.
B)the appearance of bony vertebrae.
C)feet with digits.
D)the mineralization of the endoskeleton.
E)the ability to move in a fishlike manner.

Question

Quizplus · Accepted Answer

The evolution of feet with digits was first observed in the earliest tetrapods, marking a major transition from fish to land-dwelling animals. While the other options may also have been observed in early tetrapods, the development of digits was a particularly significant adaptation for life on land.

A Trend First Observed in the Evolution of the Earliest