Answer: A controlled experiment is the only research method that can establish a cause and effect relationship.
Explanation:
a. thermal power
Because it use heat energy
the investment most infected by local conditions in my opinion is A. real estate
Answer: the production of crops for sale and is designed to produce crops for widespread distribution
Explanation:
In order to achieve the economy of scale, therefore, commercial farming needs to be very efficient and practiced on a large scale as the goal of the farmer is to maximize the profit margin.