natural selection

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Across
  1. 3. the act or process of selecting : the state of being selected. : one that is selected : choice. also : a collection of selected things.
  2. 5. a change or difference in condition, amount, or level, typically with certain limits
  3. 6. the passing on of physical or mental characteristics genetically from one generation to another
  4. 7. the activity or condition of competing
  5. 8. Charles Robert Darwin FRS FRGS FLS FZS JP was an English naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology.
  6. 9. a distinguishing quality or characteristic, typically one belonging to a person
  7. 10. the action or process of mutating
Down
  1. 1. Biological fitness, also called Darwinian fitness, means the ability to survive to reproductive age, find a mate, and produce offspring.
  2. 2. the stopping or inhibition of something, such as a secretion, excretion, normal discharge, or other function.
  3. 4. a branching diagram showing the cladistic relationship between a number of species