1. Evolution: The Evidence
You will be able to explain how fossils and homologous structures are used to show the evolution of a species

2. Evolution: The Evidence
Importance of fossils:
*Provides blue prints of organisms*
determine age of rock layer (law of superposition
tells environment of land then

3. Evolution: The Evidence
Fossils provide us with homologous structures
Homologous Structures are body parts from two different organisms which have a similar structure and design
Body Parts Contain same number of bones and muscle attachments.

4. Evolution: The Evidence
Homologous Structures:
Pectoral Fin-Whale Arm Human Wing Chicken
All basically have same basic design; much different uses however, (determined by environment)

5. Evolution: The Evidence
Evolution also supported by the study of Embryology
Embryology is the study of developing embryos
Scientists can see very diverse organisms as adults have very similar beginnings (p.553)

6. Evolution: The Evidence
Human Embryos have
tails
gill slits (remnants)
share this trait with majority of all vertebrate organisms
shows possible link to an aquatic ancestor (fish????)
Eventually traits disappear EXCEPT

7. Evolution: The Evidence
As an adult you still have a tail bone, called the coccyx bone
Remnant of this bone plus other things such as the appendix, and ear muscles are called Vestigial Structures
Vestigial Structures are organs or body parts that no longer have a purpose

8. Evolution: The Evidence
Evolution can also be studied at cellular level as well
All living things made up from cells
For all living organisms made the molecule for life is DNA
DNA made up of 6 basic elements
Oxygen, Nitrogen, Hydrogen, Phosphorus, Sulfur, Carbon

9. Evolution: The Evidence
All cells contain the same building blocks of proteins, fats, and carbohydrates
Most cells have a nucleus and a nuclei; have gel like layer of cytoplasm
More closely related the organism, more they have in common

10. Evolution: The Evidence
Human Question?
Human DNA is almost 99% identical to chimpanzee DNA
Humans Chimpanzees, Apes belong to group of mammals called PRIMATES

11. Evolution: The Evidence
ALL PRIMATES HAVE THESE TRAITS
Opposable thumbs, binocular vision, rotating shoulder, large brain