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Sponges are called the simplest animals because they: Have no nerves Have no muscles Have no internal organs, including a brain All of the above None of the above
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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.
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Which organ controls breathing? lungs alveoli heart diaphragm
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