Which of the following is an example of facilitated diffusion? A. liquid molecules colliding with one another
B. reaching an equal amount of molecules on both sides of a membrane
C. Red blood cells allowing glucose to move in and out
D. cytoplasm keeping an organelle in place

I am not very sure but it is most probably C.

Red blood cells allowing glucose to move in and out

Explanation:

facilitated diffusion:

diffusion of molecule due to concentration gradient via transport proteins

glucose movement through membrane occur via GLUT transporters

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.  

cell division is not regulated in tumor cells.