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Mass extinction
o
which
many species become extinct over a relatively short period of time
o
Entire ecosystems vanish
o
Causes: asteroid, volcanic eruptions, moving
continents, changing sea level
o
New opportunities to survivors
Speciation: formation of new species
o
Causes
§
Reproductive isolation
§
Behavioral isolation
§
Geographic isolation
§
Temporal isolation
o
Darwin’s Finches
Evidence for Evolution
Fossils
·
Preserved remains or traces of ancient organisms
·
Some fossils of extinct animals are similar to
living species
Anatomy and Embryology
·
Homologous structures: structures that are
shared by related species and that have been inherited from a common ancestor
·
Analogous structures: body parts that share
common function, but not structure
DNA
·
The universal genetic code = evidence of common
descent
Differential Reproductive Success
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- Note on Untitled, created by K. Avery on 27/09/2014.
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