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science vocab 2

eras,eons,etc

TermDefinition
Cenozoic Era era of recent life that began about 66 million years ago and continues today;first appearance of Homo Sapiens about 400,000 years ago
Mesozoic Era middle era of Earth's history, Pangaea broke apart, dinosaurs appeared and reptiles and gymnosperms were the dominant land life forms
Dinosaur a reptile from one of the 2 orders that dominated the Mesozoic
Paleozoic Era era of ancient life, began about 5444 million years ago, when organisms developed hard parts and ended with mass extinctions about 245 million years ago
Geologic Time Scale division of Earth's history into time units based largely on the types of life-forms that lived only during certain time periods
Cyanobacteria chlorophyll-containing, photosynthetic bacteria thought to be one of the Earth's earliest life-forms
Precambrian Time longest part of Earth's history, lasting from 4.0 billion to about 544 million years ago
Trilobite organism with a three-lobed exoskeleton that was abundant in the Paleozoic oceans and is considered to be an index fossil
Natural Selection process by which organisms that are suited to a particular environment are better able to survive and reproduce than organisms that are not
Life state of being in which one grows, reproduces, and maintains a constant internal environment
Eon longest subdivision in the geologic time scale that is based on abundance of certain types of fossils and is subdivided into eras,periods and epochs
Era 2 longest subdivision of geologic time;is subdivided into periods and is based on major worldwide changes in types of fossils
Period 3 longest division of geologic time;is subdivided into epochs and is characterized by the types of life that existed worldwide
Epoch next smaller division of geologic time after period;is characterized by difference in life-forms that may vary regionally
Organic Evolution change of organisms over geologic time
Species group of organisms that reproduces only with other members of their own group
Created by: rconner
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