13. What happens to a coniferous tree when the top is routinely trimmed (as is done at Christmas tree farms)?
A. The coniferous tree's natural apical dominance is inhibited.
B. The coniferous tree's apical buds are removed.
C. The coniferous tree's axillary buds are encouraged to form lateral branches to compensate
for sunlight.
D. All of the above.

because the light is a great source of energy for the plants to survive. (i hope this )

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.  

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.