Unit 11 Crossword Puzzle

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Across
  1. 2. The process by which a single species in a certain geographic location evolves rapidly into multiple new species.
  2. 4. The process by which the traits of a population of organisms change over many generations.
  3. 5. Structures in different species that have similar functions but which evolved separately.
  4. 7. A method of dating to determine the age of an object by measuring the amount of a radioactive isotope it contains.
  5. 9. A preserved remnant, impression, or trace of an organism that lived in the distant past.
  6. 13. A type of fossil or series of fossils that shows the intermediate stages of evolutionary change.
  7. 15. A species from which two or more species evolved.
  8. 16. A method of dating to estimate the age of an object (such as a fossil) by comparing it with something else.
  9. 17. Any mammal belonging to the subclass Eutheria. Before birth, the developing young are attached to the maternal uterus by a placenta and nourished through it.
  10. 19. Published the theory of natural selection.
Down
  1. 1. A system that describes the chronological timing of events that have occurred throughout Earth's history.
  2. 3. A theory stating that organisms better suited to their environment will thrive and thus pass on their genetic characteristics to the next generation.
  3. 6. The science that describes the changing distributions of living and fossil biological species and factors affecting the variations in distributions.
  4. 8. Structure A structure in an organism that has lost all or most of the original function it had for an ancestor.
  5. 10. Any mammal in which the female does not have a true placenta and usually has a pouch on the abdomen to carry the developing young animal.
  6. 11. The movement of the Earth's continents relative to one another due to plate tectonics.
  7. 12. Physically similar structures that perform different functions in different species.
  8. 14. The branch of biology that deals with the development of an organism, from the fertilization of an egg to the fetus stage.
  9. 18. All of the resources a species uses within its ecosystem.