What animals are classed as fish?

Sharks, rays, eels and sea horses are all 100% fish, whereas whales, dolphins, starfish and jellyfish are not fish. So what makes fish different from other animals? Fish are unique in that they have a combination of gills and fins and that they live only in the water.

What are 2 ways fish protect themselves?

Defense Mechanisms: How Marine Creatures Avoid Predation

  • Staying in School. Schooling is one of the primary ways many fishes help defend themselves from predators. …
  • Blending In. …
  • Using Speed and Maneuverability. …
  • Sticking it to ‘Em. …
  • Poisons and Potions. …
  • Mimicry. …
  • On the Fly. …
  • Safe at Home.

What are the five characteristics of vertebrates?

As chordates, all vertebrates have a similar anatomy and morphology with the same qualifying characteristics: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.

What makes fish distinctive?

What distinguishes fish from the other animal classes? … The combination of gills, fins and the fact that they live only in the water make fish different from all other animals.

Which type of fish are sharks?

Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays.

What are the five kinds of vertebrates?

The phylum chordata (animals with backbones) is divided into five common classes: fish, amphibians, reptiles, mammals and birds.

What are the characteristics of fish vertebrates?

The main divisions of vertebrates are fish, amphibians, reptiles, birds, and mammals. Fish have fins and scales. They live in water whether fresh or salty and breathe oxygen through their gills. Reptiles are air breathing that have internal fertilization and scaly bodies.

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