Which inventors changed agriculture with machines that worked well on midwestern prairies? O Cyrus McCormick and John Deere
O Thomas Jefferson and Eli Whitney
O Cyrus Reaper and Robert Plough
O Elias Howe and Linus Yale

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.

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b: the exchange of coined money