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Evolution & Extinction, Environment Change, Using the fossil record.,…
Evolution & Extinction
Environment Change
Mass Extinctions
Today
65
Million Years Ago
205
Million Years Ago
251
Million Years Ago
360-370
Million Years Ago
440
Million Years Ago
60% of species lost
70% of species lost
80-95% of marine species lost
Catastrophic
Fossil record suddenly "goes quiet".
why no more dinosaur's? scientific evidence:
extinction 69 mya
180 km Diameter crater of the coast of chicxulub in mexico
2 more items...
Iridium
1 more item...
50% of marine invertebrates
80% of quadrupeds
50-70% of Species Last/Survive
Climate Change
Tropical organisms don't like
Using the fossil record.
Most animals remain in fossil
record is fragmentary.
Some animals are however well represented.
The Horse
Modern Horse
2 million years ago
1.6 m tall
Modern Hoof
Plio Hippus
5 million years ago
1.0 m tall
fused toes
Merrychippus
25 million years ago
1.0 m tall
three wide toes
Hydracotherium
55 million year ago
0.4 m tall
4 toes
Mesohippus
35 million years ago
0.6 m tall
3 toes
Extinction
Total species over time:
4 billion
Total alive today
8.7 million
Always
Caused by change in an organism's environment
Sometimes this is national selction.
Survival of the fittest.
Animal change over time.
OR
New animals out compete them
New Predictors
hedgehog eating eggs of groundnesting birds
New Diseases
Alternatively they're put forward!
Not a sudden event!
Global Warming
Caused Melting Sea Ice
Chilled the Seas and Oceans
down by 9*
Mass Extinction Slowly Triggered