Periods of History Flashcards
History of Life Unit
1
Q
Precambrian
A
- simple multicellular animals
- bacteria, protists, fungi
2
Q
Cambrian Explosion
A
- first predators
- first armor (exoskeletons)
3
Q
Ordovician Period
A
- shallow seas covered land
- coral reefs
- cephalopods
- jawless fish
4
Q
Silurian Period
A
- jawed fish
- terrestrial plants
- air breathing animals
5
Q
Denovian
A
- bony fish
- amphibians
- wingless insects
- all major plant groups except flowering
6
Q
Carboniferous
A
- swamp forest
- reptiles (shelled eggs)
- winged insects
- BIG BUGS
7
Q
Permian Period
A
- Therapsids (reptile ancestors of mammals)
- gymnosperms
- seed plants dominant
- ended the Paleozoic with the greatest mass extinction (90% marine, 70% land vertebrates)
8
Q
Triassic Period
A
- Thecodonts
- Pleiosauras and Ichthyosaurs
- Pterodonts
- First Mammals (small insectivores)
- 2nd invasion of the sea
9
Q
Jurassic and Cretaceous
A
- Dinosaurs!
- Saurischians (ancestors of birds)
- Ornithischians (gigantic dinosaurs)
10
Q
Tertiary
A
- diversification of flowering plants, birds, insects, mammals
- North and South America crash together
- opossum came North
- Bears, llamas went South
11
Q
Quartenary Period
A
- genus homo
- large mammals
12
Q
five mass extinctions
A
- Ordovician (Continental Drift)
- Devonian (Bolide Event)
- Permian (excess Co2)
- Triassic (meteorite)
- Cretaceous (meteorite)
13
Q
when did mammals undergo adaptive radiation?
A
post-cretaceous
14
Q
A
