Darwin's observation's crossword

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Across
  1. 1. Organs that have been reduced in size to the point in which that they're just traces of homologous structures
  2. 4. Principle stating that all organisms living/extinct originated from common ancestors
  3. 8. process of inheriting characteristics or traits to increase organism fitness
  4. 9. Members of each species compete regularly for resources
Down
  1. 2. Process in which nature provides variation, in which organisms select most useful variations
  2. 3. Process in which organisms' survive and thrive within their suited environment
  3. 5. an individual's ability to survive and reproduce in it's specific environment
  4. 6. structures containing different mature forms but, develop from same embryonic tissue
  5. 7. taking place without humans individuals of a population reproduce with increasing selected traits over time contributing to an organisms fitness