The answer I believe would be C ammonification
No. The natural selection is when the best suit fits survive. Therefore is not the idea that as an environment changes.
The rotation of the Earth in its axis
Asexual reproduction is better because it is more convenient!
1. It only requires one organism
2. Results in more offspring
3. Usually a quicker process
OR
Sexual reproduction is better because it results in more genetic diversity!
1. Requires two organisms of the same species
2. Genetic material mixes together to create a random, unique combination
3. Recombination of genes decreases the chances of defects, diseases and mutations
Hope this helped some! :)