Despite later claims that african americans were physically superior to whites in athletic ability, early use of these statistics claimed they were inferior and would become

And would become extinct due to infant mortality.

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Explanation:

d. they are naturallyoccuring inorganic fuels like coal and petroleum.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.