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Theory of Evolution All life on Earth descended from a common ancestor Life originated as a simple form, and became more diverse and complex over time
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Fossil Record as Fair Test (Part II)
Evolution Fossil Record as Fair Test (Part II) Theory of Evolution
All life on Earth descended from a common ancestor
Life originated as a simple form, and became more diverse and
complex over time Fossil Record A record of the 4,600,000,000 year
long natural history of our planet I. Evidence in the Fossil
Record
Evidence that life changed through time: simple complex Evidence of
change in one type of animal through the years Transition
species:evidence of hybrids between two types 99% of all life which
has ever existed is now extinct What does the fossil record tell
us?
Life originated in a simple form and become more complex and
diverse with time. Example #1: Example #2: Example #3: What does
the fossil record tell us?
2) Organisms have changed over time Changes within a type of
animal: Sea Urchins (video) Horse (video -can you describe?) Horse
Transitions Each branch tip on the tree of horse evolution
indicates a different genus, though the feet of only a few genera
are illustrated to show the reduction of toes through time. What
does the fossil record tell us?
2) One problem with the theory of evolution is the conspicuous lack
of transition fossils Is this true? Archaeopteryx Other Transition
Fossils
Transitions from one type into another: Skulls:reptile/mammal
hybrids(Why is this significant?) Whale Transition Fossils(See pbs
evolution) Assignment! Fossil Record: Evolution of Mammals
Skulls showing the changes in the jaw articulation and the ear
region in the evolution from reptile to mammal. Whale Transitions
Whale Transitional Forms What does the fossil record tell us?
3) 99% of all organisms which have ever existed are now extinct!
(The life we observe today has not been the life through the
ages!)