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Portage Learning- BIOD 151 Exam 1 Study online at 1. What are the six levels of organization in the body?atom, mole- cule, macromol- ecule, organelle, cell, tissue, or- gan, system of organs, and or- ganism 2. The necessary life function that protects our internal en- vironment from our external environment is provided by what system? Integumentary system 3. The function