ecology

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Across
  1. 1. (the smallest structural and functional unit of an organism)
  2. 6. (the action or process of observing something or someone carefully or in order to gain information.)
  3. 8. ( put something forward as a hypothesis)
  4. 10. (a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.)
  5. 12. (something having many related parts that function together as a whole)
Down
  1. 2. ( a scientific procedure undertaken to make a discovery)research
  2. 3. (a collection of beliefs or practices mistakenly regarded as being based on scientific method.)
  3. 4. (the systematic study of the structure and behavior of the physical and natural world through observation, experimentation, and the testing of theories against the evidence obtained.)
  4. 5. (a conclusion reached on the basis of evidence and reasoning.)
  5. 7. (the study of living organisms)
  6. 9. (the branch of biology that deals with relations of organisms)
  7. 11. (a statement that describes an observable occurrence in nature that appears to always be true)