Answer:
There are two types of fish - bony fish, and cartilaginous fish. The main thing that sets bony fish apart from cartilaginous fish is the presence of a skeleton made of bone (a cartilaginous fish has a skeleton made out of - you guessed it - cartilage.)
Bony fish also have a hard, bony plate, called an operculum, covering their gills. They may also have distinct rays, or spines, in their fins.
Characteristics and Classification of Bony Fish:Some documents refer to the bony fish as the Osteichthyes, which used to be recognized as a class of organisms.Osteichthyes is still used commonly to refer to the two main types of bony fish:
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their eggs don't have shells and they breath with their scales.
Fish are aquatic, and have gills, fins, and bones.
they rproduce sexually [lay eggs]
Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils.
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