Fish use fins to help them swim better. If you go swimming, you will swim faster, with swim fins, instead of just feet. Fins are better for fish instead of hands.
gold fish have 7 fins
There are two sets of "paired" fins. The ones on each side of the fish behind the gills are the "Pectoral Fins" and the ones in front of the fishes vent on the underside of the fish are the "Ventral Fins". Sometimes these fins are wrongly refered to as "Pelvic Fins".
no fish are animals that have only 2 fins
Correct
Dolphins have fins instead of fingers. However, inside the fins they have finger bones, which are similar to the ones found in human hands.
Thats how they swim
Its how evolution made them, they grew fine without hands or feet and would have little use for them.
Pectoral fins.
It is the theory that paired fins arose in jawed fishes from the evolution of ventrolateral skin folds in jawless, basal fishes. The folds then separated and specialized to form the paired pectoral and pelvic fins in more evolved fishes.
Bats are mammals like you and me, hence, have anuses.
They swim, they have gills, they live under water, they are sea creatures. They have fins, they travel in schools, they live underwater, and they have scales. Most fishes have gills, fins, and scales. Their skeletons are either made of cartilage and bone. they are cold blooded
Yes. Fins, a swim bladder, the composition of their bones, and their muscles all help a fish to swim.