He basically made the first safe and effective vaccine for the disease Polio
Brown eyes, black hair, long hair, curly hair, 5'7 , brown skin, round ears, detached earlobe, big lips, small nose, strong face, round head, big feet, big hands, freckles
One allele can only produce one trait
The answer to the above question, is C. the main two sources are wind and sun (wind turbine and solar panels).