the gene present in DNA responsible for inheritance...
i don't know
when i know
i your question is a bit incomplete but i would like to give you the overview of fossils record as an evidence of evolution on earth.
fossils records provide evidence of the evolution since the records various tools that were used in future such as stone tools as well as sticks were used for various activities in the future.
these tools have been evolved and recently what is being used are modern tools unlike the stone tools as well as sticks.