a
reptile
b
fish
c
mammal
d
amphibian
Explanation
Correct Option
bVideo Explanation
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Discussions (8)

Biyabra
4 years ago
The answer is B (Fish) because fish has only two chambered heart compared to reptiles and amphia with three Chambers each and mammals with four chambers so is fish that have the most simplest heart structure.

Myschool Kelly
10 years ago
Thanks for your contributions. Correction has been made, the correct answer is B.




