How does a proper warm up affect blood flow?
o a.
blood flow increases.
b. blood flow decreases.
oc. blood flow increases and then decreases.
od. blood flow decreases and then increases.

A.blood flow icreases

but i would double check with someone else

Well, l think that some effective communication is, emotional barriers and lack of attention, interest distraction or irrelevance. also some physical disabilities such as hearing problems or speech difficulties.      l hope i am correct  and you good luck.