Chapter 29, Problem 12RQ

Why are the lobe-finned fishes significant?

To determine

The significance of the lobe-finned fishes.

Answer to Problem 12RQ

The lobe-finned fishes are most significant due to their lobe that evolved from fins to provide walk support for later terrestrial vertebrates. And some of the lobbed-fishes also evolved internal nostrils for enabling the breath through the air.

Explanation of Solution

The Devonian period is one of the periods of the Paleozoic era, and it began from 419.2 million years ago and lasted for 60 years. Due to the evolution of fishes and other aquatic animals, this period is also known as the Age of the Fishes.

The lob finned fish of that period is the most significant organism due to their evolved lobed from their fins that are further evolved into amphibian's legs. Some of the lobed-fin fishes evolved the nostrils that enabled them to breathe air.

Conclusion:

Therefore, the lobe-finned fishes are most significant due to their lobe that evolved from fins to provide walk support for later terrestrial vertebrates. And some of the lobbed-fishes also evolved internal nostrils for enabling the breath through the air.