Gamma rays are produced by applying 1)electric and magnetic fields parallel to each other
2)crests and thoughts at right angles to each other
3)electric and magnetic fields at right angles to each other
4)crests and troughs parallel to each other

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: