Old and new species

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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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Fichas por yusanr98, actualizado hace más de 1 año
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Resumen del Recurso

Pregunta Respuesta
What are fossils? Fossils are the remains of organism from many years ago that are found in rocks.
What can we learn from fossils? Fossils gives us information about that lived millions of years ago.
What is extinction? It is a permanent loss of all the members of a species.
How do living organisms cause extinctions? Extinction may be cause by new predators, new diseases or new, more successful competitors.
What caused the mass extinctions of the past? Mass extinction may be caused by single catastrophic events such as volcanoes or asteroid strikes.
How do new species arise? New species arise when two populations become isolated.
How do population become isolated? Population become isolated when they are separated geographically, e.g on islands.
How 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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