Concept explainers
To describe: Fishes and their characteristics that distinguish them from other animals.
Introduction: Around 550 million years ago (mya), that is in the early Paleozoic era, the fishes have appeared first. The fishes approximately comprise around half of 64,000 vertebrate species. Among the living groups of fishes, the five main groups include cartilaginous, lobe-finned, ray-finned fishes, lampreys, and hagfishes.
Explanation of Solution
The fishes are defined as the aquatic vertebrates having gills as well as appendages in the form of fins. They mainly differ from other animals in their bodies, which is streamlined that allows the fishes to move through the water. They move at angles or forward using the fins. They are capable of maintaining the composition of body fluids in seawater as well as freshwater environments as they have excellent organs for the exchange of water and salt. They have excellent visual as well as olfactory senses. The gills of fishes are very effective in oxygen extraction; even a very low amount of oxygen is present. They also have a lateral-line system and this provides sensitivity to vibrations and water currents.
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Chapter 24 Solutions
INTEG.PRIN.OF ZOOLOGY(LL)
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College