Evolution
- Created by: Bubblestree
- Created on: 08-03-14 10:30
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- EVOLUTION
- Evidence
- Fossils
- Pieces of rock and minerals that preserve the skeletons of organisms.
- By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. However, many early forms of life were soft-bodied - and have left few traces behind.
- Fossils
- Fossil Record
- By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. However, many early forms of life were soft-bodied - and have left few traces behind.
- Horses have a good fossil record.
- Horses have evolved from a multi toed organism to a hooves.
- Extinction
- If a creature is poorly adapted to it's environment, it could die before it reproduces. So the population will decrease then become extinct.
- Changes in environment can cause extinction.
- Climate Change.
- New diseases.
- New predators.
- New competitors.
- New species
- Isolation. This is where two populations of the same species become geographically separated.
- Genetic variation. Where each population has a wide range of alleles that control their characteristics.
- Natural selection. Where the alleles which help an organism to survive are selected in each population.
- Speciation. Where the population becomes so different that successful interbreeding can't happen any more.
- Evidence
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