Unit X Vocab Set 2

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