All matter in the universe is composed of unique pure substances called elements, such as hydrogen, oxygen, carbon, nitrogen, calcium, and iron.

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• Person: Not available Organization: Lumen Learning
  Structural Organization of the Human Body | Anatomy and ...

Sources

• Structural Organization of the Human Body | Anatomy and ... courses.lumenlearning.com Lumen Learning via serper

Referenced by nodes (3)

• oxygen concept
• hydrogen concept
• carbon concept