Question

fish are classified into three main groups: 1. agnatha (jawless fish): primitive fish with no jaws, scales, or paired fins. skeleton made of cartilage. examples: lampreys and hagfish. 2. chondrichthyes (cartilaginous fish): skeleton made of cartilage instead of bones. strong jaws and sharp, tooth - like scales called denticles. examples: sharks and rays. 3. osteichthyes (bony fish): skeleton made of bones. have jaws, paired fins, and scales. examples: trout, goldfish, and salmon. what are the three main groups of fish? choose the correct answer. sharks, rays, trout agnatha, chondrichthyes, osteichthyes mammals, reptiles, amphibians

Explanation:

The text clearly states that fish are classified into three main groups: Agnatha (jaw - less fish), Chondrichthyes (cartilaginous fish), and Osteichthyes (bony fish).

Answer:

Agnatha, Chondrichthyes, Osteichthyes