When is the not used before a superlative degree ? some one help me now i have no time​

The is not used with superlatives in predicative position.

Explanation:

The is not used with superlatives in predicative position, when we compare the same person or thing in different situations. He is nicest in the evenings after he has had a few drinks. (NOT He is the nicest in the evenings …)

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.

i think its the first one