You must think it's normal to be awake during the day and sleep at night, but that's not true for all animals. Humans are diurnal, the scientific term for tending to be up and about during the hours when the sun is up. Being awake in daytime has some obvious advantages: It's warm, it's easy to see, and at least for humans, sunshine provides much-needed vitamin D and also makes us feel good. But for many animals, being up at night, or being nocturnal, is a great arrangement. Small animals who are in danger from predators can gather food more safely in the dark. And some animals can fix their way around by using senses other than sight - bats, for example, use their sense of hearing to navigate. In hot climates, it can also be a good thing to avoid the bright sun and spend the day curled up in a cozy cave or den.

A. Sunshine provides much-needed vitamin D and also makes us feel good
B. Humans are diurnal
C. It can also be a good thing to avoid the bright sun
D. It's normal to be awake during the day and sleep at night

Match each excerpt to the correct stanza structure. 1. it was many and many a year ago, in a kingdom by the sea, that a maiden there lived whom you may know by the name of annabel lee; and this maiden she lived with no other thought than to love and be loved by me. (from "annabel lee" by edgar allan poe) 2. o thou, new-year, delaying long, delayest the sorrow in my blood, that longs to burst a frozen bud and flood a fresher throat with song. (from "in memoriam" by alfred lord tennyson) 3. nature’s first green is gold, her hardest hue to hold. her early leaf’s a flower but only so an hour. then leaf subsides to leaf. so eden sank to grief,; so dawn goes down to day. nothing gold can stay. (from "nothing gold can stay" by robert frost) 4. at sestos hero dwelt; hero the fair, whom young apollo courted for her hair, and offered as a dower his burning throne, where she should sit for men to gaze upon. the outside of her garments were of lawn, the lining purple silk, with gilt stars drawn; (from "hero and leander" by christopher marlowe) quatrain couplet octave sestet