Genotype and the environment both can affect a phenotype. Phenotype= a physical feature resulting from a certain genotype.
For example, let's say a person born with a genotype pp has the phenotype: pale skin. However, if they live in a sunny environment, then the melanin in their skin will increase over time changing their phenotype to tan skin. Does that make sense as to how both factors can impact phenotype?
The residents can carpool from place to place, bike, or walk, which significantly reduces fumes. They can also grill less, and have fewer fires in their fireplaces.
