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Old and new species
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- 1What are fossils?Fossils are the remains of organism from many years ago that are found in rocks.
- 2What can we learn from fossils?Fossils gives us information about that lived millions of years ago.
- 3What is extinction?It is a permanent loss of all the members of a species.
- 4How do living organisms cause extinctions?Extinction may be cause by new predators, new diseases or new, more successful competitors.
- 5What caused the mass extinctions of the past?Mass extinction may be caused by single catastrophic events such as volcanoes or asteroid strikes.
- 6How do new species arise?New species arise when two populations become isolated.
- 7How do population become isolated?Population become isolated when they are separated geographically, e.g on islands.
- 8How does speciation take place in an isolated population?Speciation takes place when an isolated population becomes so different from the original population that successful interbreeding can no long take place.
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- GCSE Biology Additional Science (AQA) Fichas sobre Old and new species , creado por yusanr98 el 04/04/2014.
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