Biodiversity

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Across
  1. 1. A variation of a gene or genetic
  2. 4. variation of life within an ecosystem
  3. 6. place where a group of different species live
  4. 7. the most advanced species in the history of the Earth
Down
  1. 2. when one species completely dies out
  2. 3. The scientific study of the basic building blocks of an organism
  3. 5. a certain type of organisms that are alike