Why is the shell can considered to be biotic? a. because it is found in the biosphereb. because it was alivec. because it came from something livingd. because it is not living

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:

answer; heredity;