There are many different natural disasters that affect the population, including hurricanes, tornados, earthquakes, tsunamis, floods, flash floods, and fires. Hope this helps! :)
Variations in a genotype could be major or minor. It really depends on the degree of change. A genotype changes due to errors mutations. Some are endogenous, occuring with the organismm often during meiosis that causes changes in a genotype.
Learn more about here: https://www.quora.com/What-causes-variation-in-genotypes-How-does-this-occur
The answer is C because plants use photosynthesis and animals use cellular respiration, so they balance each other out.
I believe this was D but i forgot.
