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Non-proteobacteria include several important bacterial classes that differ in structure, metabolism, and ecological role. One class is Firmicutes. These bacteria are Gram-positive and have thick peptidoglycan cell walls. Many members can form endospores, which help them survive harsh environmental conditions such as heat and dryness. An example is *Bacillus subtilis*, which is commonly found in soil and is known __________ __________ _______ _____ ___ __________.
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