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22 Cards in this Set
- Front
- Back
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Casts and Impressions
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Formed when an organism is buried in a soft material like clay which hardens around it and the organism decays,
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Fossils
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The remains of organisms from many years ago, which are found in rocks.
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Don't decay easily
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Teeth and bones
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Correct temperature, moisture and Oxygen
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Conditions needed for decay
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The first organisms were soft bodied
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A reason we don't know when life on the planet started
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Extinction
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When no more of the species is alive anymore
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Speciation
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Formation of a new species
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Isolation
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Separation of two or more groups within a species
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Allopatric
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Geographical separation of a species
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Alleles
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Versions of genes
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Dodo
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An recently extinct type of bird
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Endemic
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When a species evolves in isolation and is found in only one place in the world
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Environmental Isolation
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This is when the climate changes in one area where an organism lives but not in others.
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The Horse
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Has a complete fossil record
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Low oxygen and Cold
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Conditions which favour fossilisation
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Amber
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Hardened tree resin
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Rock
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Layers of sediment eventually become...
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Theory of evolution
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simple life forms gradually evolved into more complex ones
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60 million years
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The time it took a horse to evolve from a dog sized creature
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Darwin
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studied the wildlife on the Galápagos Islands
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Variation
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Difference between individuals
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Natural Selection
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where the alleles which help an organism to survive are selected in each population
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