Answer the following question given this paragraph: Magnetite naturally attracts iron nails and filings. Its natural magnetism was discovered thousands of years ago. Q: What are magnetites naturally attracted to? Choices: - stone - aluminum - glass - iron A:
iron

Answer the following question given this paragraph: The supertree also shows that another major diversification of mammals occurred about 50 million years ago. Again, worldwide climate change may have been one reason. This time Earth's temperature rose. The warmer temperature led to a greater diversity of plants. This would have meant more food for mammals or their prey. 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

Answer the following question given this paragraph: Biofuels are useful because they are liquid. Biofuels can go into a gas tank unlike many other types of alternative energy. Q: What form do biofuels take that makes them very useful? Choices: - crystals - solid - chemical - liquid A:
liquid

Answer the following question given this paragraph: Figure below shows the main gases in air. Nitrogen and oxygen make up 99 percent of air. Argon and carbon dioxide make up much of the rest. These percentages are the same just about everywhere in the atmosphere. 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