Q.3. Which of these is a fish? (jelly fish/ silverfish/ starfish).

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Please find below the solution to the asked query  
          
All the fishes that belong to the phylum Chordata are called True fishes. So, none of them is a true fish. 
Silverfish, jellyfish and starfish are all invertebrates. 

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Silverfishis a fish. This is because fish have backbone and silberfish have . Jellyfish and starfishis not a fish because they both don't habe backbones.
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None of them are really a fish . A starfish is not a fish , it has no gills , fins or scales . Jelly fish is not a fish , it belongs to a group called invertebrates while fishes are vertebrates . Silverfish are not fish , they are insects , but are so called as they resemble a fish and its movement . Hope this helps
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