another po thx in advance
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Answer:
1Early humans choose to stay in natural caves because they provided shelter from the rain, heat and wind. Natural caves and rock shelters can be found .
3Reinforced concrete techniques were developed to the point that precast concrete panels were used in house and church construction as well as commercial buildings. In fact complete houses were built that resembled weatherboard houses in appearance. Reinforced concrete was also used extensively in bridge building.
Explanation:
I don't know in number 2