biology

Edit Answers
1234567891011121314151617181920
Across
  1. 4. Diagram that shows the evolutionary relationships among a group of organisms
  2. 7. process by which individuals that are better suited to their environment survive and reproduce most successfully
  3. 13. Process by which unrelated organisms independently evolve similarities when adapting to similar environments
  4. 15. able to survive and reproduce viable offspring
  5. 16. A trait that helps an organism survive and reproduce
  6. 18. competition among members of a species for food, living space, and the other necessities of life
  7. 19. the diminishing of a conditioned response; occurs in classical conditioning when an unconditioned stimulus (US) does not follow a conditioned stimulus (CS); occurs in operant conditioning when a response is no longer reinforced.
  8. 20. A scientist who studies fossils
Down
  1. 1. Formation of new species
  2. 2. An evolutionary pattern in which many species evolve from a single ancestral species
  3. 3. Process by which two species evolve in response to changes in each other
  4. 5. English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
  5. 6. The division of the Earth's history into a series of named units.
  6. 8. theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms
  7. 9. Change over time
  8. 10. principle that all living things were derived from common ancestors
  9. 11. A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.
  10. 12. Pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
  11. 14. Structures in different species that are similar because of common ancestry.
  12. 17. mutations