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Disinfection of impression materials is usually accomplished by a. sterilization with high heat. b. spray or immersion in a chemical disinfectant. c. sterilization with steam under pressure. d. allowing the impression to sit 24 hours in water until all the organisms die.

When plants use sunlight to make food, the energy of sunlight is

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil