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!)