earth

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Across
  1. 2. the study of the interrelationships of organisms with other organisms with other organisms and with their non-living environment
  2. 5. different populations living in the same place at the same time
  3. 8. the variety of life on earth. measured at the genetic, species and ecosystem level
Down
  1. 1. a group of individuals of the same species living in the same place at the same time
  2. 2. a community of living organisms and non-living factors
  3. 3. the place where a population of organisms live
  4. 4. a layer around the earths surface that supports life
  5. 6. non-living components of ecosystems
  6. 7. living organisms