<span>A variable is an object that you are trying to measure. It has two
types; independent and dependent variable. An independent variable is a
variable that is not affected b other variables. A dependent variable on the
other hand is a variable that depends on the other variables. Suppose you want
to know the quality of sleep of the students in their academic performance. The
quality of sleep is the independent variable and the academic performance is
the dependent variable. The answer is letter B.</span>
Answer: Its not that is getting smaller, its just that as you higher and higher up the biomass pyramid, more energy is loss..that's why it seems to be getting smaller. oh and its biggest at the bottom because energy is most at the bottom.
This is a solid substance that is composed of minerals. This describes the dynamic changes between sedimentary, metamorphic, and igneous substances. This occurs are mid-ocean ridges where a new oceanic crust is formed and then slowly moves away from the ridge.
The basis of the process of Natural selection is the random mutation: some organisms develop random mutations which increase their chance for survival and they survive more likely than other organisms and reproduce.
So the correct answer is: A) Through random mutations in DNA, some pests developed a resistance to the pesticide.
