Darwin's observation's crossword

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