Answer:
1.645 trillion US dollars
Explanation:
Grain farming is done for economic activity and this makes it commercial. It is highly specialized and mechanised. The yield per acre is low so the farms are big. The yield is high per man so little manpower is needed for production. Grain farming is subject to market conditions like climate.
<span>condensation to form liquid water, which then rained back down to form the oceans</span>
