Answer:
controlled by the Arabs, who brought frankincense and myrrh by camel caravan from South Arabia.
Answer:
Groundwater pollution
Explanation:
Pesticides, when sprayed on crop plants, are able to flow below the surface of the ground, reaching water-bearing aquifers, thereby contaminating groundwater, making it unsuitable for both human and agricultural uses.
In my opinion the answer is identical
The element that is most reactive to gas is Hydrogen