MASS EXTINCTIONS

MASS EXTINCTIONS

After the Cambrian explosion billions of species have existed but 99.9% of them are now extinct,why?The answer is because at this time between Cambrian explosion and present cataclysmic events have done formidable mass extinctions,these mass extinctions are the worst part of our past and could be a part of our future.The first extinction took place 450mya in the Ordovician era,a star exploding and it’s radiation hits the Earth and wiped out 70% of aquatic life on our planet.The next one was the longest,it last for 10 million years,starting 377mya,volcanoes pump out poisonous gasses that fell again in the water as asset rain and kill 65% of life.The next is the mother of extinctions,the Permian extinction,a supervolcano in what is now Siberia erupted and with again asset rain wiped out 95% of life on the planet that looks like the film of 2012.The next is at the end of the Triassic period,a today’s USA volcano erupted,wiped out 80% of life and start the breaking of Pangea.The next you must heard it,it’s the extinction of dinosaurs 65mya,an asteroid 12 miles across slammed in Earth and wiped out 75% of life on Earth.That was the last major extinction in our history.But is 1 question that no one want to hear:Could humanity survived the next extinction?Mass extinctions may hear very bad,but they can change evolution,for our bad or for our good,for example the Ordovician one change the evolution of arthropods with book lungs and give them the ability to breath out of the water the 30% lower oxygen levels.The Devonian extinction give to an amphibian called Ichthyostega legs and lungs to take out of the water,on to dry land.So mass extinctions are not good but not bad,they are something at the centre,yet.