The study abroad alien marvin, who lives in san francisco, has been asked to host a teenage alien, regor, as part of an intergalactic exchange program. marvin is sure that regor would love to experience the adventure of sailing, but decides he should introduce the concept of a sailboat first. marvin tries to describe the common features of a sailboat. he explains that they are pointed at the front and square at the back, have a tall mast to hold up the sail, and have one or two triangular sails. which of the following demonstrates a problem with this approach?