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What are fossils?

remains or imprints of once-living organisms

How do fossils form?

when a dead organisms is covered by a layer od sediment or mud

Cast Fossil

minerals in the sediment replace the bodys material with minerals that harden over time

Fossil Record

all of the fossils that have been discovererd / scientist can learn about the history of the Earth

Trasitional Fossils

fossils that help fill in gaps in the fossil reocrd

New VS. Old

-fossils found in new layers of Earths crust tend to have physcial or molecular similarties to present day orgnaisms
-older fossils are less similar to present day organisms

Evidence To Evolution

-modern spieces and extincit species share and ancetsor
Common Ancetsor- most recent specie in which 2 different species have evolved
* structual DNA supports this theory


embryology- study of development

Related Organisms

* fossils give evidence
* DNA/ hypothesis
*transtional character of extinct species to see how changes happened


Molecular evidence alos show that the DNA of mammals is very similar

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