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Evolution_life
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Cambrian Explosion
appearance and/or diversification of almost every major group of animals
Cambrian: Marine animals/plants
invertebrates -- arthropods
vertebrates – earliest fossil record
High diversity in algae
Selurian-Devonian
adaptive radiation of fish - dominant life form
arthropods (insects, millipedes)
spore-bearing plants
Devonian Period 400 mya
1st amphibians
spore-bearing vascular plants
seed ferns dominate
Carboniferous- 350 mya
Laurasia-
radiation of arthropods & amphibians
1st reptiles appear
swampy, tropical seed fern forests
1st gymnosperms
Permian/Triassic Period 250 mya
radiation of reptiles
1st dinosaurs
very early mammals
(laid eggs)
monotremes only direct descendant of this early line
Late Jurassic-140 mya
reptiles dominate ("the Age of the Dinosaurs”)
early birds
gymnosperms dominate
1st flowering plants (angiosperm)
100 mya Cretecious
angiosperms
-- rapid adaptive radiation & dispersal
insect adaptive radiation (co-evolution)
gymnosperm decline in dominance
65 mya -- K-T extinction
evidence of asteroid impact
mass extinctions
40 Mya- Tertiary
adaptive radiation of mammals & birds
the "Age of Mammals"
tropical forests
grasslands -- grazing mammals
(co-evolution)
3 mya - Panama isthmus rises
quaternary period 2 mya
"megafauna”
humans evolve
tree species richness declines
herbaceous species dominate angiosperms
Evolutionary trend in which un-related species develop similar physiological traits & morphologies in response to similar enivronmental conditions
divergent evolution
sympatric speciation
natural selection
convergent evolution
adaptive radiation
Author
kamrunsreno
ID
17299
Card Set
Evolution_life
Description
NRES Final
Updated
2010-05-02T22:56:38Z
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