What kinds of anthropogenic activities produce acid rain? 1 the use of refrigerants and aerosols
2 burning of fossil and plant fuels that produce carbon dioxide
3 agricultural fertilizers and methane from animal wastes
4 coal and oil power plants and automobiles

it restores trees to areas where they once grew.

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: