Which stress on a population is a direct result of overcrowding? air pressure changes
rapid spread of disease
mutation
O immigration

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:

the answer you are looking for is the united states forest service.

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