Question

one species of bat affected by wns is the little brown bat. this bat has a very small mass (about 14 g) and hunts for flying insects at night. females typically give birth to one offspring per year.
in preparation for winter, little brown bats eat more insects to build up fat reserves in their bodies. in winter, they hibernate, which decreases body temperature, breathing rate, and metabolic rate. the bats do not eat while they are hibernating.
little brown bats typically wake up only for brief periods of time during hibernation. when a bat wakes up, its body temperature increases to a fever around 40°c, then returns to hibernation temperature.
wns affects the number of times that a bat wakes up during hibernation. healthy bats wake up about every 25 days, and about 85% survive hibernation. bats infected with wns wake up once every 9 days, and only about 4% survive hibernation.
the graph shows the amount of fat loss during hibernation in healthy bats and in wns - infected bats in north america.
graphs titled fat loss during hibernation of bats in north america with x - axis time since starting hibernation (days) and y - axis fat loss (mg) or fat loss (energy) for different graphs, and key showing solid line for wns - infected bats and dashed line for healthy bats
2 select from the drop - down menus to correctly complete the sentences.
during the hibernation period, infected bats use more energy than healthy bats. they use more energy because they awake more to combat the wns.

Explanation:

The problem is about the energy use and fat loss of bats during hibernation, especially comparing WNS - infected and healthy bats. This involves biological concepts like metabolism, hibernation physiology, and the impact of a disease (WNS) on an organism's energy - related processes. So the subfield of Natural Science, specifically Biology, is the most appropriate as it deals with the study of living organisms and their physiological processes.

Answer:

Biology (under Natural Science)