Random changes in allele frequency in a population are usually called genetic drift. The reason why this is the answer is because it is a very specific word which is used to describe exactly that - random changes in allele frequency.
All the other cases; answers, here aren't correct and don't apply.
Answer:The Sun and moon both has its impacts on the hydrosphere region on earth. ... About 70% of the earth surface is covered by water. The sun plays an important role as it warms the ocean water in the equatorial and the polar region that increases the temperature of the water on the surface of the oceans.
