Extinction (AQA GCSE Biology): Flashcards
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Definition of extinction
Definition of extinction
Entire species died out, no individuals remain
Extinction in evolutionary history
Extinction in evolutionary history
Natural part of evolution
Extinction factor: environmental changes
Extinction factor: environmental changes
Rapid climate shifts species can't adapt to
Extinction factor: new predators
Extinction factor: new predators
Species unable to defend themselves or escape
Extinction factor: new diseases
Extinction factor: new diseases
Devastating if lacking genetic diversity & resistance
Genetic factors in disease extinction
Genetic factors in disease extinction
Species lack resistance alleles & genetic diversity
Extinction factor: competition
Extinction factor: competition
Outcompeted for food by species w/ better mutations
Extinction factor: catastrophic events
Extinction factor: catastrophic events
Natural disasters instantly wipe out species
Examples of catastrophic events
Examples of catastrophic events
Volcanoes, earthquakes, tsunamis, asteroid impacts
Extinction factor: habitat destruction
Extinction factor: habitat destruction
Habitat loss when species can't migrate/adapt
Causes of habitat destruction
Causes of habitat destruction
Human activities or natural processes