Which of the following describes RNA -RNA is usually single-stranded and contains uracil
-RNA is made and carries out its functions in the nucleus
-RNA is usually double stranded in contains thymine
-RNA is longer and contains five bases

RNA is usually single stranded and contains uracil

Explanation:

DNA is the one which is double stranded (has a helical structure) and it has the nucleotide bases; Adenine, Thymine, Cytosine and Guanine whilst RNA is single stranded and does not form a double helix like DNA. RNA also has the same nucleotide bases but instead of having Thymine it has Uracil.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

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.