What is a discovery that Dr.
Dowel makes about the virus?

i do believe   by (keeping an organized record of all sources he or she referenced)good luck.

explanation:

answer; analytical,creative and practical;

where are the choices

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .