Which is the best description of activation energy?

The activation energy is the energy that must be present before for a reaction is to occur. it can be altered and lowered by the use of a catalyst that offers an alternative pathway with a lower activation energy.

hope that helps :)

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.