The brain waves of sleeping infants appear to be qualitatively different from those of an adult who is dreaming.

The answer is no one knows the answer, however it is unlikely young infants do not have much to dream about, given -their relatively limited experiences. The brain waves of sleeping infants appear to be qualitatively different from those of adults who are dreaming.

B - Python predation has caused a trophic cascade that changed the mosquitoes' niche.

Explanation:

The passage infers that the predation by the Burmese pythons has reduced the population of the animals in Southern Florida thus making the Culex cedecei mosquito to have a reduced number of options to feed from. This is stressed when the author notes that these mosquitoes are now feeding on cotton rats which harbor the Everglades virus that also have the potentials of being transmitted to humans.

Summarily, the passage is saying that the invasion by the Burmese python has changed the niche of most animals including the mosquitoes in the Southern Florida's wild.