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How did early humans survive their harsh environments?

AThey built homes out of stone.
BThey built homes out of wood.
CThey built walls around their homes for protection.
DThey lived in caves and rock shelters.

Verified Answer :

One way in which early humans survived their harsh environments was that "They lived in caves and rock shelters," since these were "natural" barriers that often required little effort to construct. 

They live in caves and rock shelters

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