Identify one of the key external difference between vertebrates and invertebrates. a) vertebrates are always radial symmetrical. b) invertebrates are always bilaterally symmetrical. c) invertebrates are always bilaterally symmetrical, while vertebrates could show either bilateral or radial symmetry. d) vertebrates are always bilaterally symmetrical, while invertebrates could show either bilateral or radial symmetry.

The correct answer is D)

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.  

the answer is 95 degrees