How can a school most effectively raise awareness of bike-helmet safety? by holding a bike-helmetâ€""awareness event by hosting a talk about bike helmets at a retirement home by expelling students who do not wear bike helmets by encouraging students to walk instead of riding bikes.

Consider the following invention from the american industrial era. cotton gin – a machine that removed seeds from short-staple cotton which option explains how this invention contributed to the role of the united states as an emerging world power? a. it was in high demand abroad, as many european nations had begun farming cotton. b. it led to the decline of slavery in the south, which enhanced america’s international reputation. c. it freed up many slaves to become factory workers in northern cities, which improved the economy. d. it increased production efficiency of a us cash crop that was in high demand in other nations.