Mark the odd one in each of the following series:
Human heart, fish heart, reptile heart, toad heart.

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Solution

Fishes have a 2-chambered heart with an atrium and a ventricle. Amphibians and reptiles (except crocodiles) have a 3-chambered heart with two atria and a single ventricle, whereas crocodiles, birds, and mammals possess a 4-chambered heart.
So the answer is "fish heart".

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\begin{matrix} (i) A m p h i b i a n s a n d m o s t r e p t i l e s & A . 2 - c h a m b e r e d h e a r t (i i) B i r d s a n d m a m m a l s & B . 3 - c h a m b e r e d h e a r t (i i i) F i s h & C .4 - c h a m b e r e d h e a r t \end{matrix}

The heart of toad has four chambers.

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