What are the 4 main characteristics of fish?

Answer 1

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:

• Ray-finned fishes, or Actinopterygii
• Lobe-finned fishes, or Sarcopterygii, which includes the coelacanths and lungfishes.

Classification of Bony Fish:

• Kingdom: Animalia
• Phylum: Chordata
• Class: Actinopterygii

Evolution of Bony Fish:The first fish-like creatures appeared over 500 million years ago. Bony fish and cartilaginous fish diverged about 420 million years ago. Read More About Fish Evolution

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Answer 2

their eggs don't have shells and they breath with their scales.

Answer 3

Fish are aquatic, and have gills, fins, and bones.

they rproduce sexually [lay eggs]

Answer 4

Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils.

Answer 5

1) Research it yourself on the internet or in a book.

2) Ask your parents or guardian to guide you.

3) Have a good day!

Answer 6

It Can only remember 3 seconds