How do we know about lewis and clark's discoveries?

Throughout the Corps' more than 4,000-mile journey, Captains Lewis and Clark recorded 178 plants and 122 animals not previously known to science. Lewis recorded and pressed and preserved some 240 different plant species and brought them back to Washington, along with hundreds of animal and bird skins and skeletons.

Explanation:

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by 1880, germany had more rail lines than great britain and russia.