The circulation brings carbon dioxide-filled blood to the lungs.
a. systemicb)pulmonary

pulmonary is the correct answer.

Explanation:

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note: for words found inappropriate, i spelled them out in the phonetic alphabet in parenthesis, so take the first letter of each word to get the word i was trying to spell

creative crowdsourcing spans sourcing creative projects such as graphic design, crowdsourcing architecture, apparel design, movies, writing, company naming, illustration, etc.

explanation: