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Description
Flashcards by rahateley1, updated more than 1 year ago
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Created by rahateley1
over 9 years ago
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| Question | Answer |
| Speciation | Lets revise! |
| What are fossils? | Fossils are the preserved remains or traces of dead organisms. They are found in rocks. |
| What 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. |
| Explain how the horse evolved | One 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. |
| Describe 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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