In the cell cycle, external regulators direct cells to
• A. speed up or slow down the cycle
• B. Remain unchanged
• C. Proceed and then stop the cycle
• D. Grow uncontrollably

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

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: