as they left the haunted house, the friends’ hearts were pounding, and they were all overly sensitive to sounds and movements. they laughed as they talked about how cool it was to be learning about the sympathetic division and to have some understanding of the involuntary changes that had happened to them as they went through the haunted house. choose all of the following statements that are true of the sympathetic division of the ans.

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.