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