Which discovery is considered to have led to the greatest advancements in the field of medicine?

I think it would be penicillin as it saved many lives in its time and ours.

Particle exchange energy though elastic collision , hope this .

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.