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