Answer:
Explanation:
Second Lieutenant William Clark was chosen because he was a friend of Captain Meriwether Lewis and because he was an experienced explorer, since he was firmly aware of different species of flora and fauna, as well as rock formations.
Lewis was directly in charge of the expedition, whose name was The Discovery Corps. President Jefferson had let him know the purpose of the trip, that consisted in the exploration of the Missouri River through a letter. Lewis accepted the trip and chose his friend Clark, who despite not having the same military rank of him, shared leadership in the crew.