AP BIOLOGY

Detailed explanation-1: -The geologic period known as the age of fish is known as the Devonian period, which belongs to the paleozoic era. It existed about 360 million years ago. This period showed the emergence of Amphibians but was dominated by fishes.

Detailed explanation-2: -The Devonian, part of the Paleozoic era, is otherwise known as the Age of Fishes, as it spawned a remarkable variety of fish.

Detailed explanation-3: -Two major groups of fishes were present by the middle Paleozoic, the Jawless Fish and the Jawed Fish. 1. Jawless fish (also known as agnaths) first appeared during the Late Cambrian and continued to be abundant in the Middle Paleozoic. They are survived today by their descendents, the Hagfishes and Lampreys.

Detailed explanation-4: -The first jawed vertebrates appeared in the late Ordovician and became common in the Devonian, often known as the “Age of Fishes". The two groups of bony fishes, the actinopterygii and sarcopterygii, evolved and became common.

Detailed explanation-5: -The Paleozoic Era is literally the era of “old life.” It lasted from 544 to 245 million years ago and is divided into six periods.