Believability Of a speaker is highly dependent on supporting materials for that are

credible

Explanation:

Public speaking refers to the process of communicating the ideas to the live audience by a specific speaker. A group of listeners and a speaker are its main elements. There are various aspects on which a speaker is required to focus while delivering a public speech. The supporting materials for or against the topic that are provided by the speaker helps in building a strong argument before the listeners. Also, the belief in the speaker is established with the credibility of the supporting materials.

answer: i would say he was very determined and persistent in overcoming obstacles.

explanation:   "the magician of menlo park" as he was called, liked to tell an incident that happened when he was 8 years old and came back home crying after attending school for three months because his teacher called him "sterile and unproductive". from nowadays perspective, we can say that thomas alva edison was one of the most persistent and determined man that has ever existed. when edison was 14, he contracted scarlet fever. the effect of the fever, as well as a blow to the head by an angry train conductor, caused edison to become completely deaf in his left ear, and 80-percent deaf in the other. so as you can see he had to struggle to not so many minor issues but he always succeeded.

some skiers think very highly of their sport.

that should be it i had the same question

brainlest me plz

explanation: