Single-Gene disease :

A) Are affected by lifestyle behaviors
B) Occur when one gene has a harmful mutation
C) Include cardiovascular disease and cancer
D) Are caused when a person inherits a single chromosome

Keep your hands washed and trash kept in trash cans.

1.controls blood flow2.controls oxygen flow3.carries oxygen rich blood to veins

Not sure exactly what kind of answer you are looking for so i hope this able to be a effective listener and also being  a good conversationalist. and most of all just being there when someone needs you.i hope this .