The natural resources used by society are limited by various factors. why is coal considered a nonrenewable resource? a. once coal is used up, it can never be replaced. b. coal is a nonrenewable resource, because it comes from the impact of meteors with the earth. c. coal was a renewable resource, until it was mismanaged by humans. d. coal is considered a nonrenewable resource, because it takes millions of years to form.

Answer=D

Coal is considered a nonrenewable resource because its use is non sustainable since it takes millions of years for it to form.

Explanation:

c

explanation:

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: