Fossils and Evolution
Evidence for Evolution B2 Topic 3
- Created by: Revise17
- Created on: 18-05-16 17:46
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- Evidence for Evolution
- Fossils are the "remains" of organisms from many years ago, found in rocks
- Hard parts of animals that do not decay easily
- Simplest organisms are found in the oldest rocks, and fossils of more complex organisms in the newest
- supports the theory of evolution- Charles Darwin
- Why is the Fossil record incomplete?
- Soft tissues decay and do not form fossils
- Organisms die without the necessary conditions for fossilisation
- may not have been discovered yet
- Organisms remains may have been separated by natural disasters
- How do Fossils Form?
- Sea creatures are alive swimming and feeding
- Sea creatures die and sink to the bottom of the sea bed
- Soft parts rot away leaving the hard shell
- Creatures hard remains get covered by sedimet
- Layers of sediment are compressed over time forming sedimentary rock
- Hard shells get replaced by minerals forming rock
- Rock is worn away over time perhaps exposed above sea level- the fossil can be discovered
- Hard shells get replaced by minerals forming rock
- Layers of sediment are compressed over time forming sedimentary rock
- Creatures hard remains get covered by sedimet
- Soft parts rot away leaving the hard shell
- Sea creatures die and sink to the bottom of the sea bed
- Sea creatures are alive swimming and feeding
- What can fossils tell us about..
- How long ago they existed
- Simplest organisms are found in the oldest rocks, and fossils of more complex organisms in the newest
- supports the theory of evolution- Charles Darwin
- Simplest organisms are found in the oldest rocks, and fossils of more complex organisms in the newest
- How long ago they existed
- Preserved traces of organisms e.g footprints
- The pentadactyl limb (5 digits) is seen in many species. In each species the limb has a similar bone structure.
- The similarity in bone structure provides evidence that species with a pentadactyl limb have all evolved from a common ancestor.
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