Q: Eight of the hottest years on record have occurred since what year? Choices: - 2002 - 1997 - 1991 - 1998 A:
1998

Q: What force is caused by microscopic bumps, lumps, and imperfections colliding? Choices: - gravitational - motion - tension - friction A:
friction

Q: What traits do the sponge and tarantula share? Choices: - number of eyes - number of legs - lifespan - lack of backbone A:
lack of backbone