Which of the following provides the best comparison between fish and birds?

they are both ectothermic, but fish have streamlined bodies and birds are bipedal.

they are both vertebrates, but fish are ectothermic and birds are endothermic.

they both lay eggs, but fish are jawless and birds have gizzards.

they both have two-chambered hearts, but fish have scales and birds have feathers

The best and most correct answer among the choices provided by your question is the second choice.

The best comparison between birds and fishes is that: they are both vertebrates, but fish are ectothermic and birds are endothermic. 

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What do you mean about innate behavior i don’t get it