Over the past 3.5 billion years the photosynthetic processes of cyanobacteria added a significant amount of this gas to the atmosphere, making possible for life as we know it to evolve?

b exhibiting favoritism toward the kikuyu people.

we would need to see the picture to answer it

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).

explanation: