Question

Which of the following aquatic organisms is classified as a fish?

whale
jellyfish
octopus
shark
I think the octopus is right but i am not sure !

Answer 1

Shark

Explanation:

They have gills,scales,swim bladders to float,most produce eggs and also in ectothermic.

Answer 2

Answer: Shark

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Further explanation:

• Whales are not fish. This is a common misconception many people have (the same goes for dolphins as well). Whales are mammals that don't have gills, which is why they occasionally come to the surface for oxygen.
• Despite "fish" being literally right in their name, jellyfish aren't fish. It's confusing I know. Jellyfish belong to the phylum Cnidaria, while fish belong to the phylum Chordata.
• Octopus aren't fish either. They are molluscs and are related to animals like snails, squid, and slugs.
• Sharks are fish. They have gills and fins like any other fish does.