In an experimental design, the variable the
researcher has control over and that is different for the treatment and control
groups is called the explanatory variable.
The explanatory variable can be controlled and
manipulated by the experimenter.
The correct answer between all
the choices given is the last choice or letter E. I am hoping that this answer
has satisfied your query and it will be able to help you in your endeavor, and
if you would like, feel free to ask another question.
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C Increased nitrogen levels in the ponds
Answer:
This may be the case because of the placements of the spread. While one is more cluttered, the other is a bit more spread apart. Meaning that the GeoChart on the right must have more cases, exactly because of their population.
To solve this problem we first need to find the amount of gametes a fruit fly produces in a meiotic division. For this we will use the formula 
, where n represents the number of gene pairs. In our case then, 
= 2.2.2.2 = 16
So a fly produces 16 different combinations of gametes. If this fly crosses another one, we have a universe of possibilities of combinations given by the multiplication of the male and female gametes. In the case, then, it would be 16 x 16.
16 x 16 = 256
