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

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

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.

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)

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)

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

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

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

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

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

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