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Chapter 6 Section 1 New Vocab

Across
Second-longest division of geologic time; is subdivided into periods and is based on major worldwide changes in types of types of fossils.
Process by which organisms that are suited to a particular environment are better able to survive and reproduce than organisms that are not.
Division of Earth's history into time units based largely on the types of life-forms that lived only during certain periods
Group of organisms that reproduces only with other members of their group.
Next-smaller division of geologic time after the period ; is characterized by differences in life-forms that may very regionally.
Down
Organism with a three-lobed exoskeleton that was abundant in Paleozoic oceans and is considered to be an index fossil.
Change of organisms over geologic time
Large, ancient landmass that was composed of all the continents joined together,
Third-longest division of geologic time; is subdivided into epochs and is characterized by the types of life that existed worldwide.
Longest subdivision in the geologic scale that is based on the abundance of certain types of fossils and is subdivided into eras, periods, and epochs.