Biology

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Across
  1. 3. smallest unit of an element that retains the chemical and physical properties of that
  2. 5. term that describes a nonliving factor in an ecosystem
  3. 6. zone of life on earth;sum total of all ecosystems on earth
  4. 7. substance that enables a chemical reaction to proceed at a usually taster rate.
  5. 8. intermolecular attraction between unlike molecules
  6. 9. basic unit of structure and function for all living organisms
  7. 11. large area or geographical region with distinct plant and animal groups adapted to that environment
Down
  1. 1. group of biomacromolecules that interact with biological systems and their environment
  2. 2. macromolecule that contains atoms of carbon, hydrogen, and oxygen
  3. 4. energy:The minimum energy required to initiate a specific chemical reaction
  4. 9. intermolecular attraction between like molecules
  5. 10. term that describes a living or once living organism in an ecosystem