Q: Q: What type of muscle makes up most of the heart? Choices: - chest muscles - heart muscle - respiratory muscle - cardiac muscle A:
A: cardiac muscle

Q: Q: What force holds together both types of star clusters? Choices: - weight - magnetism - inertia - gravity A:
A: gravity

Q: Q: When did we learn there was a hole in the ozone layer? Choices: - 1950s - 1970s - 1990's - 1980s A:
A: 1980s

Q: Q: What do glands in the skin produce to cool down the body? Choices: - lactic acid - saliva - mucus - sweat A:
A: sweat