Answer:
The name of three structures that are most commonly found in all types of fishes are as follows-
1) Fishes have 2 chambered heart of which one is called the atrium and the other is called ventricle. In the body of the fish, the blood escapes the gills and it circulates within the remaining parts of the body.
2) All fishes respire with the help of gills. As they live freely in water, they are comprised of evolved gills that helps them in eliminating the dissolved oxygen from the water.
3) Fishes have fins that are attached to their body and it helps them to move freely in any direction they want. This fins enables them to control their movement in the water body.
