How does the respiratory system depend on the circulatory system in order to function?
A. The circulatory
system brings waste
gases to the lungs
and exchanges
them for oxugen.
B. The circulatory system
provides structural
support and protection
to the respiratory
system
C. The circulatory
system pushes
gases out of the
body through the
mouth and nose.
D. The circulatory system
sends messages to the
lungs so that one can
breathe in and out.

A)

Explanation:

The correct answer is A) because the circulatory and respiratory systems are working together in order to provide oxygen throughout the body.

They are helping the body to circulate blood and oxygen. Air is moving in and out of the lungs through a respiratory system which is including the trachea, bronchioles, and bronchi.  

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