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 suggests that Regor compare the features of an item that he thinks might be a sailboat with a checklist of sailboat features. If there are sufficient overlapping features, he might determine that it is a sailboat. This could be considered a .

Asoccer mom is driving her 75 year old grandmother and her 9 year old daughter home after the game. the grandmother and daughter were both in the back seat and both were wearing their seat belts. a car ran a red light in front of them, causing them to t-bone that car on the passenger side. fortunately there were no serious injuries, but the grandmother did sustain several rib fractures. the mother, daughter and driver of the at-fault car were shaken up but unhurt. what are some possible reasons that the grandmother sustained rib fractures while the other victims did not?