heart problems often cause trouble breathing. which best explains this?
PLEASE EXPLAIN WHY YOU CHOOSES YOUR ANSWER
a the heart provides the lungs with oxygen.
b the lungs use the circulation caused by the heart
c the lungs are the organs that bring carbon-dioxide into the body
d white blood cells are produced by the lungs
PLEASE EXPLAIN WHY YOU CHOOSES YOUR ANSWER
a the heart provides the lungs with oxygen.
b the lungs use the circulation caused by the heart
c the lungs are the organs that bring carbon-dioxide into the body
d white blood cells are produced by the lungs