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DLT lesson 1.4

The History of Life on Earth

TermDefinition
fossil a trace or an imprint of a living thing that is preserved by geological processes
fossil record all of the fossils that have been discovered worldwide
extinction when every individual of a species dies
geologic time scale the standard method used to divide Earth’s long 4.6 billion-year natural history into manageable parts
prokaryotes a single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles
Paleozoic ancient life
absolute dating estimates the age of a fossil in years
relative dating determines if a fossil formed before or after another fossil
asteroid small rocky body orbiting the sun
Mesozoic Era Includes the Triassic, Jurassic, and Cretaceous Periods
cyanobacteria a prokaryote that released oxygen into the air to create our atmosphere
ozone a gas layer in the upper atmosphere
eukaryote have cells with a nucleus and are more complex than prokaryotes
dinosaur large reptile living during the Mesozoic Era
Cenozoic Era the current era
Created by: rippert
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