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Q.

I’m the first organism to possess back bone. My body is covered with scales. Heart is two chambered and use gills for respiration. Who am I?

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a

Frog

b

Fish

c

Snake

d

Sparrow

answer is B.

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Detailed Solution

Fish has 2 chambered heart (atrium & ventricle). They use gills for respiration. FIshes are the first organisms to posses back bone.

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I’m the first organism to possess back bone. My body is covered with scales. Heart is two chambered and use gills for respiration. Who am I?