<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>
A hyena
B the great lion
C caribou
D the lions brother
E I think the crocodiles.....they eat plaints for when they have a tummy ace.....
