The helots were slaves and they were also mercenaries, so they fought for the Spartans, usually against Persia and Athens.
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You would be mostlikely to find a high population density "along the banks of
<span>the Niger River," since rivers bring water, which is a crucial element of human survival. </span>
Answer:
A slave
Explanation:
Slaves would do all the work for people. They'd take care of everything so I'm not saying A is right, but that is the answer I would go with. Unless I knew other wise.