Question

question 24
in addition to the cotton gin, eli whitney also invented or improved on:
a machine tools that made interchangeable parts for guns and clocks
b telegraphs
c mechanical reapers
d steamships

Explanation:

Eli Whitney is known for his work on interchangeable parts. He developed machine tools that could produce standardized parts for guns and clocks. Telegraphs were related to Samuel Morse, mechanical reapers to Cyrus McCormick, and steamships to Robert Fulton.

Answer:

A. Machine tools that made interchangeable parts for guns and clocks