Biology question

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

How does natural selection change thephenotypes within a population over time?

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form