When the united states first entered the space race, nasa devised three projects that would develop manned spaceflight in stages. in chronological order, these projects were mercury, gemini, and apollo. each project had specific mission goals that were focused on both immediate and long-term results. project mercury focused on preliminary and initial manned spaceflight, with the overall goal being to establish a well-rehearsed escape and recovery procedure for manned space vehicles. project gemini, built on procedures developed in project mercury, focused on establishing the "meat and potatoes" of advanced spacecraft operation such as orbital control maneuvers, spacewalks, and orbital rendezvous and docking. the overall goal of project gemini was to enact a series of techniques that would allow astronaut crews to reach the moon in relative safety. finally, project apollo, by far the most ambitious of the three projects, focused on regular visits to the moon with the goal of capturing research data on extraterrestrial bodies. all three projects were extremely successful in both immediate and long-term goals. what organizational method is used to organize this paragraph