Pl he me What is the name of the vast plain that stretches from Kenya to Tanzania

Serengeti

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Serengeti

Explanation:

thats it hope this helps :)

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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.