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(C) The evolutionary sequence of the heart reflects the increasing complexity of the circulatory system:$1$. Fish: Have a $2$-chambered heart (one atr

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Fish,Amphibians,Reptiles,Birds

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(C) The evolutionary sequence of the heart reflects the increasing complexity of the circulatory system:$1$. Fish: Have a $2$-chambered heart (one atrium and one ventricle).$2$. Amphibians: Have a $3$-chambered heart (two atria and one ventricle).$3$. Reptiles: Generally have a $3$-chambered heart (with a partially divided ventricle),except for crocodiles which have a $4$-chambered heart.$4$. Birds and Mammals: Have a $4$-chambered heart (two atria and two ventricles) for complete separation of oxygenated and deoxygenated blood.Thus,the correct sequence is Fish $\rightarrow$ Amphibians $\rightarrow$ Reptiles $\rightarrow$ Birds.

List-$I$	List-$II$
$(i)$ $65$ million years ago	$(p)$ Sea weeds existed
$(ii)$ $350$ million years ago	$(q)$ Invertebrates formed
$(iii)$ $500$ million years ago	$(r)$ Jawless fish evolved
$(iv)$ $320$ million years ago	$(s)$ Dinosaurs disappeared

Which of the following represents the correct evolutionary sequence of the heart?

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