1. In humans, dark hair (D) is dominant over blond hair (d). If a heterozygous dark haired man had a son with his blond haired wife, what would the probability be that the son
would have dark hair like his father?

the answer to your question is b

the answer is "a.) well–developed vascular system."

explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

i believe it would be c: tons.