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1. The correct sequence of levels forming the structural hierarchy is (a) organ, organ system, cellular, chemical, tissue, organismal; (b) chemical, cellular, tissue, organismal, organ, organ system; (c) chemical, cellular, tissue, organ, organ system, organismal; (d) organismal, organ system, organ tissue, cellular, chemical.
Answer: (c) chemical, cellular, tissue, organ, organ system, organismal.
Critical Thinking Questions
4. Two of these organ systems bear the major responsibility for ensuring homeostasis of the internal environment. Which two? (a) nervous system, (b) digestive system, (c) cardiovascular system, (d) endocrine system, (e) reproductive system.
Answer: (a) nervous system and (d) endocrine system.
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