1. the region north of 66½° n latitude is the arctic circle. a. use the simulator to tell which season has the longest amount of daylight b. what do you notice about the length of day versus the length of night for the fall and spring equinoxes? (toggle the bar at the right-hand of the simulator to set to the correct season, then press play. remember that the star on the bottom of the screens indicate what time the sun rises then sets during that simulation) a. b.

Spider crabs live in the shallow regions of the ocean floor. algae tend to grow on the surface of spider crabs. the algae provide the crabs protection from predators by camouflaging them. the spider crabs give the algae shelter. what does this description suggest? 1. the algae are parasites of the spider crabs. 2. the algae and the spider crabs have a mutualistic relationship. 3. the spider crabs are commensals, and the algae are parasites. 4. the spider crabs benefit from the algae living on them. 5. the spider crabs are parasites of the algae.