Question # 6 What is the purpose of the pleura that surrounds the lungs?
To exchange oxygen for carbon dioxide
To protect against friction during breathing
To create negative pressure in the thoracic cavity
To maintain the temperature within the lungs

To protect against friction during breathing

Explanation: the pleura kind of acts like a lubricant during the expansion and contraction of lungs. :)

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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

the second one is wrong

explanation: