Which is true about the pleural sac? it is continuous with the atmosphere and protects the lungs from infection. it is a closed sac surrounding each lung and contains a large volume of surfactant. it is a closed, air-filled space surrounding both lungs that has a negative pressure compared to atmospheric pressure. it is bounded by pleural membranes that are very thin, which allows for abundant gas exchange. it is a closed sac surrounding each lung that contains only a tiny volume of lubricating fluid?

Astudent completed a lab report. which correctly describes the difference between the “question” and “hypothesis” sections of her report? “question” states what she is asking, and “hypothesis” states the result of her experiment. “question” states what she is asking, and “hypothesis” states what she thinks the answer to that question is in “if . . then . . because” format. “question” describes what she is trying to find out, and "hypothesis" states the procedures and methods of data collection. “question” describes what she is trying to find out, and “hypothesis” states any additional information or prior knowledge about the question.