Heredity is best described as a. the single-most important influence on skill-related fitness b. natural abilities that cannot be changed c. highly mutable personal characteristics d. none of the above

Heredity is BEST described as B. natural abilities that cannot be changed. So, for example, if one of your parents or ancestors had blue eyes, there is a possibility that you are going to inherit blue eyes as well. These are some of the characteristics that are passed down to you by your predecessors, which you cannot change naturally, but rather by undergoing an operation.