Answer:
1 crop rotation maintains soil fertility because crops use up different nutrients
Three essential <span>principles of test construction are:
1. consistency. It refers to the consistency </span><span>between the goal of the subject, course, and the methods of teaching goals. Also consistency between the methods and what the test measures. </span><span>
2. validity. Validity refers to t</span>he ability of a test to measure what it was designed to measure. It can be material od skill.
3. reliability. The <span>test must be constructed in such a way that it will produce reliable, consistent results .</span>
A shortage occurs when demand exceeds supply – in other words, when the price is too low. However, shortages tend to drive up the price, because consumers compete to purchase the product. As a result, businesses may hold back supply to stimulate demand.
