Question

Example of vertebrate anatomy that evolution of life forms has occurred on earth

Answer 1

The important theories related to biological evolution are:
(i) Lamarckism or Lamarck’s theory of evolution.
(ii)Darwinian theory of evolution.
(iii) Mutation theory of evolution.

2.Lamarck’s theory of evolution states that life forms occurred due to the use and disuse of organs.
Example Giraffes in beginning did not have long necks. Gradually, their necks became longer to access leaves from taller trees. This acquired character passed on to further generations and finally giraffes acquired long necks. This is called inheritance of acquired characters.
(i)Lamarck explained this theory in his book Philosphie Zoologique.
(ii)August Weismann offered the greatest opposition to the inheritance of acquired characters and put forward his theory of continuity of germplasm in 1892.