A four chambered heart is not found in

Three chambered heart is found in :-

Three chambered heart is found in :-

(i) According to theory of chemical evolution the perimitive atmosphere was oxygen (ii) Protista was the ancestral forms of modern bacteria. (iii) Woolly mammoth which lived years ago was available in petrified remains. (iv) Four chambered heart is found in crocodiles.

(i) According to theory of chemical evolution the perimitive atmosphere was oxygen (ii) Protista was the ancestral forms of modern bacteria. (iii) Woolly mammoth which lived years ago was available in petrified remains. (iv) Four chambered heart is found in crocodiles.

For the first time development of four chambered heart is seen in

Four chambered heart is present in

Four chambered heart is present in

Four chambered heart is present in