Describe a situation in which a bacteria-free environment would be desirable: not desirable:

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Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries