Slide 17 Flashcards
(18 cards)
In which scenario does range expansion re-develop sympatry relevant
Peripatric and parapatric speciation
Secondary contact for allopatric speciation
Geographical barrier removed
4 consequences to secondary contact
Fusion
Reinforcement
Stable hybrid zones
Speciation
Name the three main eras in order
Paleozoic -> Mesozoic -> Cenzoic
What is meant by the habitable zone?
Earth is not too cold and not too hot
2 evidence for RNA rather than DNA to be in the first life form
- RNA can self-replicate
- RNA catalyzes biochemical reactions
Why do scientists believe first cyanobacteria was anaerobic
Little evidence of oxygen in early earth
Cyanobacteria are known as stromatolites. When are they dated back to?
3.5 bya
2 facts about cyanobacteria
- developed photosynthesis
- led to increase in oxygen in the atmosphere
Phylum of jellyfish, sea pen, and coral
Cnidaria
Phylum of comb jellies
Ctenophora
When did cambrian explosion occur
520-540 mya
What era started after cambrian explosion?
Paleozoic era
3 characteristics on how cambrian animals differed in morphology compared to precambrian animals
Cambrian:
- larger
- elaborate mouthparts
- bilateral symmetry
What caused the cambrian explosion
Oxygen
In which period and era did colonization of land by animals and plants happened
Devonian period, paleozoic era
Thee major types of plants
Non-vascular plants, seedless vascular plants, seed plants
List 5 major extinctions (in order)
End cretaceous
Late triassic
End permean
Late devonian
End ordovician
