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 amniotic egg.

Question

Quizplus · Accepted Answer

The appearance of feet with digits was a trend first observed in the evolution of the earliest tetrapods. This adaptation allowed for improved mobility and navigation on land. The other options were also important evolutionary advancements, but they did not arise until later in the evolution of tetrapods.

A Trend First Observed in the Evolution of the Earliest