Q: Vitamin d is made in the skin when it is exposed to what? Choices: - darkness - water - dirt - sunlight A:
sunlight
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Q: Triploblasts include a broad range of animals, from flatworms to arthropods to what? Choices: - cells - mammals - invertebrates - vertebrates A:
vertebrates
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Q: What do refrigerator magnets contain that make them stick to a refrigerator door? Choices: - steel - zinc - copper - iron A:
iron
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Q: What increases the size of a population's gene pool? Choices: - mass extinction - microbes - natural selection - mutations A:
mutations
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