Lewis and Clark explored the Missouri River in hopes of finding a the sources of the Arkansas and Red rivers.

b a water route across the continent.

c a water route to New Orleans.

d the shortest route to the Pacific Ocean.

b

Explanation:

.

i discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation:

the answers is b.   environments.