The Factors that affect the demand are First, Willingness to
buy convey a desire, based on what economists call tastes and preferences. You may need nor want something, you will not
buy it then the Ability to buy convey that income is important. Second, size or
composition of the population can affect demand. The more children a family
has, the greater their demand for clothing. There is a need for the
Consumer to understand the changes because if there is greater demand there is
a greater supply.
It flowers at night so the precious fluid will not go to waste and evaporate. Since few animals move around during the day, it does this so that way it can attract the most pollinators (bats).
I honestly dont know the answer to this