They different because there made different and come from different resources
Genes are responsible for every cellular differences in a way that it is active on the same type of cell and inactive in another type of cell. The reason for genes to be active in a specific cell is because of enzymes or protein that turn it on.
Centaurea maculosa which just means pioneer species in short
<span>The pleura serous membrane is found lining the thoracic cavity and the lungs. The pleura membrane is folded and creates a sac around the filled with pleural fluid. the pleural fluid is created and reabsorbed continuously. There are two pleura serous membranes, one for the left lung and the other for the right lung.</span>
I think the letter "D" would be the best answer. i'm not completely sure though.