science terms crossword

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Across
  1. 2. the hard, pointed part of a birds mouth
  2. 3. the biological processes an organism uses to maintain a stable internal body temperature, despite fluctuations in the external environment
  3. 5. a precursor or forebear, either person or species, from which another has evolved
  4. 6. the natural home or environment of a plant, animal or other organism
  5. 8. the complete disappearance of a species from earth
  6. 9. a change in a genetic sequence
  7. 10. the change in the heritable characteristics or biological populations over successive generations
  8. 12. the preserved remains of a plant or animal from the past
  9. 14. relating to water; living in or near water or taking place in water
  10. 15. the inability of certain bird species to fly
  11. 16. broad, flat limbs adapted for swimming
  12. 17. the evolution of different forms or structures in related species as they adapt to different environment
  13. 18. a group of aquatic flightless birds
Down
  1. 1. a group of organisms capable of interbreeding and creating fertile offspring
  2. 4. the large and extremely cold area around the north pole
  3. 5. the process by which organisms develop traits that enhance their survival and reproduction
  4. 7. the study of genes, genetic variation, and heredity, encompassing how traits are passed from one generation to the next through dna
  5. 11. the long-term pattern of weather in a particular area
  6. 13. a mechanism of evolution