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Gas exchange is needed to supply _____________ to cells and remove __________________
carbon dioxide; oxygen
oxygen; carbon dioxide
carbon dioxide; water
What is the main function of the respiratory system?
to provide oxygen and remove carbon dioxide from the body
to bring oxygen to the body
to break down food and absorb nutrients
to remove oxygen from the body and deliver carbon dioxide
The air sacs that are covered with capillaries where gas exchange takes place.
Name the structure through which gases enter and leave the body of an insect.