UNIT X p2

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Across
  1. 4. method of determining the age of a fossil by comparing its placement with that of fossils in other rock layers
  2. 6. diagram depicting patterns of shared characteristics among species
  3. 9. structures that are similar in different species of common ancestry
  4. 10. the branch of biology and medicine concerned with the study of embryos and their development.
  5. 12. classification comprising related organisms that share common characteristics and are capable of interbreeding
  6. 14. body parts that share a common function, but not structure
  7. 15. the study of the evolutionary history of lineages of organisms
  8. 16. refers to the colloquial name of a taxon or species. It is the name known to the general public or is based on any language
  9. 17. distinctive fossil that is used to compare the relative ages of fossils
  10. 18. A name used by scientists, especially the taxonomic name of an organism that consists of the genus and species
Down
  1. 1. evolutionary branch of a cladogram that includes a single ancestor and all its descendants
  2. 2. classification system in which each species is assigned a two-part scientific name
  3. 3. the study of past and present distribution of organisms
  4. 5. molecules in different organisms that show similarities in their composition (DNA, RNA and proteins)
  5. 7. a larger, more inclusive taxonomic category than a kingdom (there are 3-Bacteria, Archaea, and Eukarya)
  6. 8. structure that is inherited from ancestors but has lost much or all of its original function
  7. 11. a trait that arose in the most recent common ancestor of a lineage and was passed to its descendants
  8. 13. method for determining the age of a sample from the amount of a radioactive isotope to the nonradioactive isotope of the same element in a sample