https://padlet.com/isabella_serratoma/t4bk92qohyo1 en-us 2018-05-10 19:14:24 UTC 2018-05-14 19:14:55 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Diskette.png isabella_serratoma https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259761989 2018-05-10 19:17:24 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259761989 isabella_serratoma https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259762444 542 million years ago , there was an explosion called the "Cambrian Explosion" it refers to the sudden appearance in the fossil record of complex animals with mineralized skeletal remains. It may represent the most important evolutionary event in the history of life on earth.

 
 ]]> 2018-05-10 19:18:53 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259762444 supremestdaddy69 https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259763024 The end-Ordovician extinction is generally attributed to two factors: the first wave of extinction may be related to rapid cooling at the end of the Ordovician Period, and the second phase is widely regarded as having been caused by the sea-level fall associated with the glaciation. The drop in sea level would have drained the large intercontinental seas and reduced the available habitat for organisms that favored those settings. No concentration of iridium has been identified near the extinction that would suggest a collide impact like the one identified at the end of the Cretaceous Period.]]> 2018-05-10 19:20:37 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259763024 supremestdaddy69 https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259765183  The Devonian began with a flourishing of life and genetic diversity, and ended with mass extinction. Some mass extinctions were caused by a single major, traumatic incident, but that doesn't seem to be the case with the Devonian mass extinction. In fact, this mass extinction was really 8-10 different extinction events over 20 million years; compounded together, they created one massive loss of genetic diversity, as about 75% of the world's species went extinct.
 ]]> 2018-05-10 19:26:51 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259765183 supremestdaddy69 https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259772065 2018-05-10 19:49:32 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259772065 supremestdaddy69 https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259772077 2018-05-10 19:49:34 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/259772077 supremestdaddy69 https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/260064747 During the final 18 million years of the Triassic period, there were two or three phases of extinction whose combined effects created the Triassic-Jurassic mass extinction event. Climate change, flood basalt eruptions and an asteroid impact have all been blamed for this loss of life. Many types of animal died out, including lots of marine reptiles, some large amphibians, many reef-building creatures and large numbers of cephalic molluscs. Roughly half of all the species alive at the time became extinct. Strangely, plants were not so badly affected.]]> 2018-05-11 19:14:32 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/260064747 supremestdaddy69 https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/260065010 The Cretaceous-Tertiary mass extinction - also known as the K/T extinction - is famed for the death of the dinosaurs. However, many other organisms perished at the end of the Cretaceous including the ammonites, many flowering plants and the last of the pterosaurs. Some groups had been in decline for several million years before the final event that destroyed them all. It's suggested that the decline was due to flood basalt eruptions affecting the world's climate, combined with drastic falls in sea level. Then a huge asteroid or comet struck the seabed near the Yucatan Peninsula in Mexico and was the straw that broke the camel's back.]]> 2018-05-11 19:15:36 UTC https://padlet.com/isabella_serratoma/t4bk92qohyo1/wish/260065010