What is a speaker doing when she uses evidence and examples to support her opinion?

When a speaker is using evidence and examples to support his o her opinion, the speaker is providing support to the statements he or she is making.

Explanation:

Whenever someone is introducing data or opinion in an oral or written speech, he or she will need to support this data or opinion by providing evidence -acquired as a result of a research conducted by himself or herself, or by a third person- and examples. These two elements will prove the credibility of the assertion made.

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in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.