Which element is a semiconductor?

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

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: