One challenge that Mestral encountered while inventing Velcro was finding — F different uses for Velcro
G a country willing to approve a patent for Velcro
H a way to make a profit by selling Velcro
J a manufacturer that would produce Velcro

it is j a manufacturer that would produce valko.

Explanation:

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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.