How did the railroad help change the prairie? A. The railroad broke up the long, continuous stretches of the grassland where animals could roam freely.

B. They used coal as a fuel, which caused pollution that harmed the grasses.

C. Railroads frequently ran into bison and other animals on the tracks, which disrupted the ability of the animals to roam freely.

D. Railroads were very noisy, which scared animals and disrupted their living patterns.

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Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. now imagine that you traveled to an earth-like planet located light-years away that is known to support life. think about what you’ve learned in this unit and make an argument for what you think would be the dominant type of life form on this planet. consider whether a notochord is required for an organism to manipulate its environment and become a dominant creature.