7. What kinds of sources should you use most in your research? Television shows
Old letters and postcards
Books and magazines
blogs and other Web sites created by Individuals​

old letters and postcard

I'm going with D. blogs and other websites created by individuals

Explanation:

Webs and blogs are usually up to date on things about the world, and it's a larger variety of research/information

a dictionary is the correct answer

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.