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5 Major Mass Extinctions AP BIO
Transcript of 5 Major Mass Extinctions AP BIO
Approximately 251 million years ago, Earth experienced its third major mass extinction. This major extinction is referred to as the Great Dying. About 96% of all marine species and 70% of all vertebrate species became extinct at this time. Multiple types of organisms were hit hard; species from marine life, plants, and vertebrates were included. Due to the large extent of species that were wiped out, it took Earth at least 10 million years to get back some of its diversity amongst species. This extinction was due to climate change in the beginning, and later on a catastrophic event took place.
. The Ordivician-Silurian Extinction Event:
Approximately 450 to 440 million years ago, the first major mass extinction occurred. About 27% of families and 57% of all genera went extinct in two direct events which occurred at the transition between the Odivician and Silurian time periods. The immediate cause of this extinction seems to be the movement of the super continent Gondwanaland into the south polar region. This caused global cooling, glaciation, and sea levels to change. Sea life were affected dramatically by these drastic changes; causing some species to be wiped out.
Late Devonian Extinction Event:
Approximately 375 t0 360 million years ago, Earth experienced its second major mass extinction. About 19% of all families, 50% of all genera became extinct during this period. Euroamerica and Gondwana were beginning to converge to create what would become known as the super continent Pangea. While the cause of the extinction is unknown, the extinction seems to have only affected marine life.
Triassic-Jurassic Extinction Event:
Approximately 205 million years, Earth experienced its fourth major mass extinction. About 23% of all families and 48% of all genera went extinct (about half of the species on Earth were wiped out; mainly amphibians). It was due to this event that the reign of the dinosaurs officially began. There is no exact reasoning as to why this extinction occurred. The most common theories are: climate change, sea levels fluctuating, asteroid impact, and etc.
Cretaceous-Paleogene Extinction Event:
Approximately 65.5 million years ago, Earth experienced its fifth major mass extinctions. About 75% of all species became extinct. About 33% of these species that were wiped out were marine life. This extinction is most commonly believed to have been caused by an asteroid impact in modern day Mexico. Since dinosaurs became extinct, it gave mammals and birds the chance to become the most dominant land organisms. Today,,mammals are very diverse;with humans being the dominant species.
By: Katlyn Doran
The Five Major Mass Extinctions