Please help!! For a test The human population has increased drastically in the last few centuries. What is the best reason why scientists may be concerned?

A: There will not be enough air for people to breathe if more people are born.

B: There will not be enough space for people to live if more people are born.

C: The human population will exceed Earth’s carrying capacity.

D: Scientists are not really concerned about this.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

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: