Studies of the fossil record show that there have been five major mass extinctions in Earth's history where a large percentage of species on the planet died out.
Naho zwo ralo, dzi recodo dza fossil dzi sumbedza uri nga tshinwe tshifhinga zwa kale, ho vha na u ngalangala ha mass ine khayo ho vha na phesethe ya zwithu zwinzhi zwa shango zwo ngalangalaho nga u ṱavhanya.