<span>Pleural sac is a two
layered membrane formed when a serous membrane known as pleura folds back onto
itself. Thus, the pleura invest the lungs and line the walls of the thoracic
cavity. However, the potential volume of the thoracic cavity increases during
inhalation.</span>
C is the answer
:) for your question (im writing extra cause answer is too small)
DNA is something everyone has in them to see
E. beef liver
none of these foods have cholesterol, in fact avocado can help lower cholesterol.
