Which trait is determined by both genetics and the environment? eye color athletic ability blood type a scar

athletic ability

Some things are 100% genetic based whilst some are 100% environmental based and some are a clear combination of the two.

Things like our color of eyes, blood type, quality vision, teeth, and certain diseases are purely genetic based. Children tend to get the eye color based on what they receive from their parents.

Whereas, what kind of language, religion and social traits you adapt are purely environmental based.

Traits that are a combination of both genetic and environment are height, weight and diseases.  

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.