Select the correct answer. The first settlers in North America were from which area of the world?
O A.
Asia
OB.
Africa
O C. South America
OD. Europe
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Ahis which describe the horizons in a soil profile? check all that apply. horizon a is mineral deficient. bedrock lies below the soil layers. te horizon o forms from organic material, horizon b undergoes the least amount of change. horizon c is least affected by the soil formation process.