Question : (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.

Question : (i) According to theory of chemical evolution the perimitiv

1.	Question : (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.
Answer» i and iv ii and iv i and iii iii and iv Answer :D