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
minerals in the sediment replace the bodys material with minerals that harden over time
all of the fossils that have been discovererd / scientist can learn about the history of the Earth
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
* 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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