Answers

2014-07-05T20:13:46+08:00

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I think the answer there is oxygen
why?
because you mentioned the respiratory system (which takes oxygen in) and you also mentioned circulatory system (which distributes oxygen)
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2014-07-06T11:20:31+08:00

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The circulatory system distributes oxygen to the body as it works with the respiratory system..

That's my answer :))) (Kahit may nakasagot na. Hahaha!)
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Haha. But still, thank you! :)
Hahaha! You're Welcome :))