2. Which of these is the work of the respiratory system?
a. gas exchange between the external environment and the body's circulatory system.
b. holding up the body and giving it support and shape.
c. breaking down food for it to be used by the body.
d. transport system of the body
a. gas exchange between the external environment and the body's circulatory system.
b. holding up the body and giving it support and shape.
c. breaking down food for it to be used by the body.
d. transport system of the body
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b
Answer:
holding up the body Ang giving it sopport