Why does a siren have a lower pitch as it moves away from you? (hurry need answer quick and fast) A. Diffraction causes the sound waves to bend.

B. Constructive interference causes the amplitude to decrease.

C. Wavelength increases at a very fast rate.

D. The Doppler effect causes a lower perceived pitch.

D) the doppler effect

Explanation:

the sound waves are more spread out as it moves away resulting in a lower pitch

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.