The carbohydrate polymer known as cellulose is mainly used for a. Storing DNA
b. Making proteins
c. Giving plants structure
d. Making muscles

u didn't rlly ask but just to lyk its b

c

Explanation:

Cellulose is the substance that makes up most of a plant's cell walls.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.