Extinction (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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Define extinction
Define extinction
Entire species dies out; no individuals remain alive
Is extinction a natural process?
Is extinction a natural process?
Yes, natural part of evolutionary history
Environmental changes → extinction
Environmental changes → extinction
Changes faster than species can adapt (e.g. climate shifts)
New predators → extinction
New predators → extinction
Species unable to defend themselves or escape
How do new diseases cause extinction?
How do new diseases cause extinction?
Lack genetic diversity & resistant alleles → mortality
Competition → extinction
Competition → extinction
Outcompeted by species with advantageous mutations
Catastrophic events examples
Catastrophic events examples
Volcanoes, earthquakes, tsunamis, asteroid impacts
Habitat destruction → extinction
Habitat destruction → extinction
Can't migrate or adapt to new environment
6 factors causing extinction
6 factors causing extinction
Environment, predators, diseases, competition, disasters, habitat