Slide 18 Flashcards
What caused the permean mass extinction?
Volcanic eruptions, releasing CO2 into atmosphere
Anoxic (no oxygen) conditions in the sea
How long did dinosaurs dominate for
150 million years
Largest terrestrial animals to ever evolve
Dinosaurs
Dinosaurs laid eggs like reptiles but were warm blooded with 4 chamber hearts
Dinosaurs laid eggs like reptiles but were warm blooded with 4 chamber hearts
When did asteroid impact happen
65 million years ago
What caused the KT extinction
Asteroid impact
Mammal advantage
- fur for insulation, not scales
- small, so need less food
- burrows shelter
- regulate temperature
- internal fertilization
Kay characters of mammals (3)
- 3 middle ear bones
- hair
- mammary glands
Grate ape characteristics
- big body
- long arms
- short legs
- no tail
Great apes (4)
- chimpanzees
- orangutans
- gibbons
- gorilla
When did speciation between ancestors of chimpanzees and humans occur
5-7 mya
What does Lucy teach us
Bipedalism evolved before large brain size
What does early hominid fossil teach us
Hominid place of birth is Africa
What does homo habilis teach us
Making primitive tools came before large brain size
List two models of hominid evolution. Which model is correct?
Progressive and evolutionary.
Evolutionary is correct
Evolved hominids had:
Larger Skull Size
Higher Forehead
Smaller Brow Ridges
Smaller Canines
Flatter Face
Two early out of Africa waves
1.9 mya (homo erectus)
600kya (neanderthals)
3 homo erectus facts
- out of africa 1.9 mya
- elaborate tools
- controlled fire
3 neanderthal facts
- out of africa 600 kya
- highly adapted to cold climates
- lived in large social groups
When did the first fossil of homo sapiens appear in east africa
300 kya - 400 kya
When did the first fossil of homo sapiens appear in europe and asia
50 kya - 100 kya
