books duration and timing of extinction events
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# Relationship with extinction events
# Major extinction events
# How can animals be protected from extinction?
# extinction event
# Extinction and its relationship to diversity
# African plants are in danger of extinction
# Extinction Threshold
# Elephants are in danger of extinction
# Polar bears are in danger of extinction
# Protecting the polar bear from extinction
# Reem gazelle threatened with extinction
# Save the panda from extinction
# How to save animals from extinction
# The lion is threatened with extinction
# Cheetahs are in danger of extinction
# Dinosaurs surviving extinction
# Protect plants and animals from extinction
# Ways to protect animals from extinction
# The risk of extinction due to global warming
# Reported extinction risk
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Source: wikipedia.org
مدة وتوقيت أحداث الانقراض (Info)
انقراض كيلواسر (Kellwasser)
وقد وقع على حدود بداية المرحلة الأخيرة من العصر الديفوني عند مرحلة الفاميني الحيوانية، (بين الفراسني-الفاميني). بشكل عام انقرض 19% من جميع الفصائل و 50% من جميع الأجناس.
انقراض هانجنبيرج (Hangenberg)
وقد وقع بنهاية الديفوني.
