Question: Answer the following question given this paragraph: You know that friction produces heat. That's why rubbing your hands together makes them warmer. But do you know why the rubbing produces heat? Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy. Heat from friction can be useful. It not only warms your hands. It also lets you light a match (see Figure below ). On the other hand, heat from friction can be a problem inside a car engine. It can cause the car to overheat. To reduce friction, oil is added to the engine. Oil coats the surfaces of moving parts and makes them slippery so there is less friction. Q: Friction causes the molecules on rubbing surfaces to move faster, which produces what? Choices: - life - precipitation - cold - heat A:
Answer: heat

Question: Answer the following question given this paragraph: Absorption is the process that allows substances you eat to be taken up by the blood. After food is broken down into small nutrient molecules, the molecules are absorbed by the blood. After absorption, the nutrient molecules travel in the bloodstream to cells throughout the body. This happens mostly in the small intestine. Q: What is the process by which the substances you consume are taken up by the blood? Choices: - evaporation - filtration - digestion - absorption A:
Answer: absorption

Question: Answer the following question given this paragraph: Two chemical species combine to produce a new compound. The general expression for this reaction is A + B C. Q: What are the largest phylum of the animal kingdom? Choices: - Crustacea - Chelicerata - Pycnogonida - arthropods A:
Answer:
arthropods