The four elements are oxygen, hydrogen, carbon, nitrogen. Before you start thinking we should float away with all the oxygen, hydrogen, and nitrogen atoms, remember that the oxgen molecules are mainly part of the water in our body (H2O). In fact, over half of the human body is made up of water (50-70%)
Explanation:
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The macromolecule that controls body temperature and absorbs vitamins is lipids
The most likely condition in here is the last option. When we talk about differential reproductive success we are talking about Darwin's natural selection and how the allele frequencies in a population may change and affect the natural mechanisms of the species. While the last option is the one who aproaches to what you are looking for, the first three options do not support the idea of success in reproduction.