Answer the following question given this paragraph: Q: What substance do the leaves of plants take in from the environment? Choices: - oxygen - hydrogen - acid rain - carbon dioxide A:
carbon dioxide
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Answer the following question given this paragraph: Seedless vascular plants have vascular tissue but do not have seeds. Q: What type of plants have vascular tissue but do not have seeds? Choices: - rocky vascular plants - ofen vascular plants - starchy vascular plants - seedless vascular plants A:
seedless vascular plants
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Answer the following question given this paragraph: Mechanical barriers physically block pathogens from entering the body. The skin is the most important mechanical barrier. In fact, it is the single most important defense the body has. The outer layer of the skin is tough and very difficult for pathogens to penetrate. Q: What type of barrier physically blocks pathogens from entering the body? Choices: - Solid - potential - molecular - mechanical A:
mechanical
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Answer the following question given this paragraph: A golf ball and a table tennis ball are about the same size. However, the golf ball is much heavier than the table tennis ball. Now imagine a similar size ball made out of lead. That would be very heavy indeed! What are we comparing? By comparing the mass of an object relative to its size, we are studying a property called density. Density is the ratio of the mass of an object to its volume. Q: Which property can you study by comparing the mass of an object relative to its size? Choices: - volume - weight - motion - density A:
density
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