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

17299

Card Set

Evolution_life

Description

NRES Final

Updated

2010-05-02T22:56:38Z

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