Numerous structures in the human body have evolved to maximize surface area. These structures often take the form of folded anatomy
and help move important substances from the system they are found it
to the blood through the capillaries. Describe TWO examples of such
structures and EXPLAIN how they allow for the regular functioning of
the human body.

Respiration begins at the nose or mouth, where oxygenated air is brought in before moving down the pharynx, larynx, and the trachea. The trachea branches into two bronchi, each leading into a lung. Each bronchus divides into smaller bronchi, and again into even smaller tubes called bronchioles.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.