Alveolar walls are thin to enable the quick passage of oxygen in and out of the lungs. The lungs works hand-in-hand with the heart and also is responsible in converting blood that's de-oxygenated into an oxygenated blood that is usable by the organ systems of the body. The alveolar walls are also designed to have thin membranes so that it can expand and constrict quickly allowing us to breather properly.
A) because the capsule allows <span>bacteria to infect organisms under harsh conditions, such as in the acidic stomach</span>
Your question doesn't make sense. Mitisis IS the process by which humans grow, thus increasing the number of cells in the body. Mitosis is a process that includes 4 phases. What exactly are you asking?
D. Ribosome
Proteins are manufactured on ribosomes, which are found in the rough ER. The rough ER is called this for the rough appearance the ribosomes give it.
