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.
1. 360 would be the net gain of ATP from the breakdown of ten molecules of glucose under aerobic conditions. The correct option among all the options that are given in the question is the fourth option.
2. The Krebs cycle does not occur if oxygen is not present. <span>The correct option among all the options that are given in the question is the second option.
3. In the Krebs cycle, the carbon atoms in a three-carbon molecules are released in three molecules of carbon dioxide.
4. Oxidation is the name of the process in which oxygen goes in and dehydration is the name of the process in which water goes out.</span>
<span>The phase of mitosis during which the mitotic spindle begins to form is
PROPHASE.
</span>At prophase, the nuclear envelope is broken down; the chromosomes disperse into the cytoplasm, condenses and become visible;
and more importantly, the mitotic spindle fibers form.