What are the similarities between cardiovascular and respiratory systems? Check all that apply A: Both systems need a healthy oxygen supply to sustain human life.
B: Both systems use high amounts of carbon dioxide in the blood stream.
C: Both systems use circulation as the primary source of transporting blood throughout the body.

i believe the answer is A and C

Explanation:

both systems work together to circulate blood and oxegyn around the body.  both need a healthy amount of oxegyn to sustain human life and use circulation as the primary source of transporting blood throughtout the body.

if you know the heimlich maneuver, go ahead and do that. if you don't ask if anyone else does, if not, call 911

hope this fam!

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~coco