The leg bones of the first tetrapod (shown in the following diagram) are hypothesized to have evolved from bones in the ____________.

Question

The leg bones of the first tetrapod (shown in the following diagram)are hypothesized to have evolved from bones in the ____________.

Quizplus · Accepted Answer

The first tetrapod (Tiktaalik) is believed to have evolved from a fish with fins. It is thought that the bones in the fins of the fish gradually evolved into tetrapod limbs over millions of years. Therefore, the leg bones of the first tetrapod likely evolved from the fins of a fish, making choice D the correct answer.

The Leg Bones of the First Tetrapod (Shown in the Following