Answer:
population density is the answer of the question
protien can be effected bc there are certain acids in your body and if u add more mutation then it messes with all the acid and stuff in your body and can be very harmful
School is an example like you have a load of work and its hard and u keep going cuz u know it will get you someone good adn another is running a marothon even though its hard you just keep going. hope this helps and please rate below :)