(a) Name the scientist who gave the theory of the origin of life on earth. What is this theory? (b) How are those species which are now 'extinct' studied?

(a) Name the scientist who gave the theory of the origin of life on ea

1.	(a) Name the scientist who gave the theory of the origin of life on earth. What is this theory? (b) How are those species which are now 'extinct' studied?
Answer» (a) Name the scientist who gave the theory of the origin of life on earth. What is this theory? (b) How are those species which are now 'extinct' studied?