True: Harmful materials may be flammable, explosive, or poisonous., Useful materials may exhibit properties such as durability, resistance to water, heat, or acid, flexibility, elasticity, and hardness., Medicines must be taken in accordance with a physician's prescription., False: Materials are considered harmful when they serve a purpose., The difference between harmful and useful materials is that useful is most likely causes damage but harmful is has a beneficial application.,

True or False: Useful and Harmful Materials

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