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.
