Is thus supposed to be a question ?
I believe that the answer to the question provided above is that the <span> the growth of what industries brought corresponding changes in labor needs which lead to the addition of slaves in their labor force.</span>
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I believe the answer is Observations.
Mayan civilizations made architectural designs to use time and days.
I hope this helps!
Lever<span>, simple machine consisting of a rigid bar that rotates about a fixed point, called a fulcrum. </span>Levers<span> affect the effort, or force, needed to </span>do<span> a certain amount of work, and are used to lift heavy objects.</span>
