11u bio 01
TRANSCRIPT
![Page 1: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/1.jpg)
Evidence of Evolution:The Fossil Record
![Page 2: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/2.jpg)
The Fossil Record
Fossils are the preserved remains of prehistoric organisms.
Paleontology is the study of fossils.
![Page 3: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/3.jpg)
The Fossil Record
![Page 4: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/4.jpg)
The Fossil Record
Layers of sedimentary rock contain fossils.
New layers cover older ones, creating a record over time.
When fossils are arrayed in the order of their age, a progressive series of changes are seen.
The younger fossils are more similar to existing species than older ones.
![Page 5: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/5.jpg)
The
Foss
il Re
cord
![Page 6: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/6.jpg)
The Fossil Record
Fossils may be used to determine information about species:
SizeWeightAgeLocationMigrationCause of extinctionDietCommon origins
![Page 7: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/7.jpg)
The Fossil Record
The Fossil record is incomplete and has many gaps.
Reasons:Species with delicate bodies don’t fossilize.
Species may not have lived in conditions that allow it to fossilize.
Fossils haven't been found.
![Page 8: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/8.jpg)
Transitional Fossils
A transitional fossil is one that represents characteristics between groups of organisms. (the missing link)
It provides a link between past and present species.
![Page 9: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/9.jpg)
Transitional Fossils
![Page 10: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/10.jpg)
Transitional Fossils
Archaeopteryx
![Page 11: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/11.jpg)
Transitional Fossils
?
![Page 12: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/12.jpg)
Assumption:Land vertebrates evolved from lobed-finned fishObservations:The first fossils of lobe-finned fish: 390 MYA.The earliest fossils of land vertebrates: 360 MYA.Prediction:The transition to land occurred 390 – 360 MYA.
Transitional Fossils: Tiktaalik
![Page 13: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/13.jpg)
Shrubin discovers Fishapod!Four limbs with webbed fins and sturdy wrist bones Neck and shouldersThick ribsFlattened skull
Transitional Fossils
![Page 14: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/14.jpg)
Transitional Fossils
Tiktaalik
![Page 15: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/15.jpg)
Transitional Fossils
![Page 16: 11u bio 01](https://reader035.vdocuments.site/reader035/viewer/2022062418/55508aabb4c905235b8b4d4c/html5/thumbnails/16.jpg)
How is the Fossil Record Evidence of Evolution?