Q: What are magnetites naturally attracted to? Choices: - stone - aluminum - glass - iron A:
iron

Q: A major diversification of what animal group occurred about 50 million years ago, possibly spurred by worldwide climate change? Choices: - reptiles - amphibians - insects - mammals A:
mammals

Q: What form do biofuels take that makes them very useful? Choices: - crystals - solid - chemical - liquid A:
liquid

Q: What makes up 99 percent of air? Choices: - oxygen and dioxide - phosphorus and oxygen - dioxide and nitrogen - nitrogen and oxygen A:
nitrogen and oxygen