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Do you remember the previous post talking about the evolution in I/GCSE Biology? in this post, we will move on talking the fossil!
Fossils
Fossil ➡️ the preserved remains or trace of a dead organism.
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4936730/292742_747930.png)
Why does fossil related to evolution?
The fossil record gives us evidence of what the living organisms were like and how they changed over time (evolved).
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4936730/946929_750769.jpeg)
Reasons for gaps in the fossil record
- Fossils do not always form
- Only form if conditions in the ground are suitable
- Soft tissue decays
- Soft tissue usually decays too quickly to fossilise
- Soft tissue forms impression fossils but only in very special conditions
- Many fossils are yet to be found
- Many are much deeper in the ground than we dig up
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4936730/471772_327136.jpeg)
Evidence of evolution from fossils:
- Many living vertebrates have the same basic pentadactyl (five fingered) structure to their limbs.
- These have been adapted to the animal’s needs.
- Suggests that they evolved from the same ancestors.
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4936730/75442_160518.jpeg)
And we're done with this topic! Well Done!
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4936730/87390_796397.png)
Drafted by Alyssa (Biology)
References:
- "fossil". Photo from the internet.
- "Evidence for evolution", https://cdn.kastatic.org/ka-perseus-images/eec8f7aec6fff27ff68ff787a7961118d89a2d2d.jpg
- "Supercomputer scours fossil record", https://media.nature.com/lw800/magazine-assets/d41586-020-00117-1/d41586-020-00117-1_17571158.jpg
- "evolution", https://cdn.britannica.com/03/55003-050-FA859C9F/horses-dawn-horse-size-all-one-toes.jpg