Which statement gives two central ideas from the passage? A. Construction of the transcontinental railroad took many years, and the transcontinental railroad helped the Union Army win the Civil War. B. Construction of the transcontinental railroad was very challenging, and the transcontinental railroad was important to the growth of the United States. C. Construction of the transcontinental railroad was very dangerous, and the transcontinental railroad made the United States a more diverse nation. D. Construction of the transcontinental railroad led to the invention of track ballast, and the transcontinental railroad helped Utah become a state

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explanation:

it is math

a caption indicating the purpose of the diagram

explanation:

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.

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