Pictured: Rupert Grint's tears at funeral for murdered teenage Harry Potter actor. Harry Potter star Rupert Grint was unable to contain his emotions at the funeral for his fellow Hogwarts' actor, Robert Knox who was stabbed to death last month.
Why is variation needed in order for natural selection to occur? If there were no differences in an organisms ability to survive and reproduce what would there be to select from? Variation in populations is key to the naturally selective pr â¦ ocess and these variations that are reproductively successful are passed on to progeny which leads to the change in populations over time called evolution.
Natural selection looks for the best traits to fit the current environment of a species. Now, natural selection does not directly cause an adaptation. This is how it works: if â¦ a mutation causes a species to produce more surviving offspring that inherit that trait, than many many many generations down the line it would be considered an adaptation.