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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.

$(i)$ Vertebrate brain	Homologous organ,Divergent evolution
$(ii)$ Vertebrate heart	Analogous organ,Convergent evolution
$(iii)$ Thorn of Bougainvillea and tendrils of Cucurbita	Homologous organ,Divergent evolution

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

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$(i)$ Vertebrate brain Homologous organ,Divergent evolution

$(ii)$ Vertebrate heart Analogous organ,Convergent evolution

$(iii)$ Thorn of Bougainvillea and tendrils of Cucurbita Homologous organ,Divergent evolution

Scientists believe that evolution is gradual. However,extinction,which is a part of the evolutionary story,is often 'sudden' and 'abrupt' and also group-specific. Comment on whether a natural disaster can be the cause of the extinction of species.

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