What did Jean Lamarck do?

Answer 1

Lamarck was the first to create a theory of evolution. He pretty much stated that animals changed over time because they INHERITED their new trait that they had to have to survive. This was disproved.

Charles Darwin found that animals changed due to NATURAL SELECTION. Natural selection is the process in which animals with a certain trait key to survival would survive in their environment and produce offspring more often than the ones without the new trait therefore passing it on to the next generation, and the next one.