How have fresh water and salt water fish adapted to deal with osmosis in their respective environments? (Site 1)

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:

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

answer; cnidarians;