Question

what are mutations?

Answer 1

"In the living cell, DNA undergoes frequent chemical change, especially when it is being replicated. Most of these changes are quickly repaired. Those that are not result in a mutation. Thus, mutation is a failure of DNA repair." ---> Here's an amazing website, all about mutations, that really helped me. Just copy the link and paste it into the address bar: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Mutations.html

Answer 2

Mutations can also be physical changes also.