How many mass extinctions have there been (excluding the current mass extinction).
Added by Albert J.
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A mass extinction is typically characterized by a significant, global decrease in biodiversity, where a large number of species go extinct in a relatively short period of geological time. Show more…
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Anand J.
For any given time in Earth's history, it is possible to estimate the rate of extinctions. Evidence reveals that these rates vary and fall into two categories: "background" extinctions and mass extinctions. The graph shows differences in the rates of the two types of extinction. What is the approximate rate of background extinctions over the time period between 500 and 200 million years ago? TWO CATEGORIES OF EXTINCTION Extinctions generally fall into two categories: MASS EXTINCTIONS A large number of species become extinct over a short period of time due to extraordinary and sudden environmental change. BACKGROUND EXTINCTIONS These extinctions occur at lower rates during times other than mass extinctions. The Great Dying Extinction of almost all dinosaur species (and 3/4 of all species on earth) approximately 10% approximately 20% approximately 40%
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Since the origin and diversification of life on earth how many episodes of mass extinction of species have occurred till date? (a) 2 (b) 3 (c) 4 (d) 5
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