Answer:
the shape of white blood cells
<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>
The correct answer to your question is <span>D. mushroom
</span>
I think they can help the birds my the climate
