biology review 4

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Across
  1. 1. persistent organic pollutants which are synthetic chemicals that contain carbon that take a long time to degrade
  2. 5. the ability of an ecosystem to maintain ecological processes
  3. 6. introduced species that take over an area
  4. 7. ________radiation a change from a common ancestor into a number of different species to be adapted for different niches
  5. 8. ________succession refers to changes that happen to the types of species that occupy an area
  6. 9. ___________succession the result of a disturbance to an area that has
  7. 12. species that are introduced to an area from somewhere else
  8. 14. ________species the first species to survive in an area
Down
  1. 1. __________ succession an occurrence in which no soil exists
  2. 2. two words eg. lead, mercury, and cadmium
  3. 3. species that naturally inhabit an area
  4. 4. the number of different species in an area
  5. 10. _____ selection a population change over time due to variations in traits and survival of the fittest
  6. 11. species same as introduced species
  7. 13. a type of POP that is used as a pesticide
  8. 14. a type of POP that was used electrical transformers until the 1970’s