chapter 1

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Across
  1. 3. all living organisms in a given area plus the physical environment and energy.
  2. 7. the sum total of all ecosystem on earth
  3. 8. it is the study of the natural world
  4. 9. it is the first step in the scientific method
  5. 12. all the population of different species that coexist and interact within the same environment
  6. 13. an individual living being composed of several organs or organ system.
Down
  1. 1. smallest/most specific unit of classification
  2. 2. a group of similar associated cells specialized to perform a specific function.
  3. 4. two or more atoms held together in a stable association with each other.
  4. 5. second smallest/most specific unit of classification
  5. 6. fundamental structural and functional
  6. 7. able to stand and walk on two legs
  7. 9. a structure composed to two tissues or more different tissues working together to perform a specific function.
  8. 10. a domain that has 4 kingdoms
  9. 11. smallest unit of an element; composed of protons, neutrons and electrons