What energy source possibly created the building blocks of life during the early parts of the creation of life on Earth?

These early cyanobacteria were the first oxygen-producing, evolving, phototropic organisms, and they were responsible for the initial oxygenation of the Earth's atmosphere, as they produced oxygen while sequestering carbon dioxide in organic molecules during the period from 2.7 to 2.2 billion years ago.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

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well, i believe that the answer is 2. : 3