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Unit 2 Chapter 4

Geologic Time

DefinitionTerm
Era of recent life that includes the first appearance of Homo sapiens. Cenozoic Era
Chlorophyll-containing, photosynthetic bacteria thought to be one of Earth's earliest life-forms. Cyanobacteria
A reptile from one of two orders that dominated the Mesozoic Era. Dinosaur
Longest subdivision in the geologic time scale that is based on the abundance of certain types of fossils. Eon
Division of geologic time that is characterized by differences in life-forns that may vary regionally. Epoch
Division of geologic time that is based on major worldwide changes in types of fossils. Era
Division of Earth's history into time units based largely on the types of life-forms that lived only during certain periods. Geologic Time Scale
State of being in which one grows, reproduces, and maintains a constant internal environment. Life
Middle era of Earth's history, during which Pangaea broke apart, dinosaurs appeared, and reptiles and gymnosperms were the dominant land life-forms. Mesozoic Era
Process by which organisms that are suited to a particular environment are better able to survive and reproduce than organisms that are not. Natural Selection
Change of organisms over geologic time. Organic Evolution
Era of ancient life, when organisms developed hard parts, and ended with mass extinctions. Paleozoic Era
Division of geologic time, characterized by the types of life that existed worldwide. Period
Longest part of Earth's history. Precambrian Time
Group of organisms that reproduces only with other members of their own group. Species
Organism with a three-lobed exoskeleton that was abundant in Paleozoic oceans and is considered to be an index fossil. Trilobite
Created by: rwaters
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