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Biology - Speciation flashcards
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- 1SpeciationLets revise!
- 2What are fossils?Fossils are the preserved remains or traces of dead organisms. They are found in rocks.
- 3What can fossils be formed from?- Hard body parts, such as bones and shells, which do not decay easily or are replaced by other materials as they decay.
- Parts of organisms which have not decayed. For example, dead animals and plants can be preserved in amber (hardened tree resin), peat bogs, tar pits or in ice
- Casts or impressions, such as foot prints or burrows. These become covered by layers of sediment, which eventually become rock. - 4Explain how the horse evolvedOne of the few animals for which we have a fairly complete evolutionary record is the horse. All the main stages of the evolution of the horse have been preserved in fossil form.
- 5Describe what Darwin investigated in the Galápagos Islands- He noticed that the finches (songbirds) on the different islands were similar to each other.
- The finches showed wide variations in their size, beaks and claws from island to island - for example, their beaks were different depending on the local food source.
- Darwin concluded that, because the islands are so distant from the mainland, the finches that had arrived there in the past and had changed over time
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- GCSE Biology Fichas sobre Biology - Speciation flashcards, creado por rahateley1 el 17/03/2015.
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