natural selection

12345678
Across
  1. 3. trait makes it more likely to survive in an environment
  2. 5. blending in with the background
  3. 7. the reason for something happening
  4. 8. a relative from a distant time
Down
  1. 1. number of people that have each trait
  2. 2. DNA that has multiple genes
  3. 4. makes genes and chromosomes
  4. 6. a result that