Has a thin atmosphere of carbon dioxide and contains the largest volcano in the solar system, as well as an enormous system of canyons. a) mars b) venus c) uranus d) mercury

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: