Picture I http://kimmontaidearvioita.blogspot.com/p/the-cambrian-era-and-mass-destructions.html Kimmo Huosionmaa The Cambrian explosion was the case in the history of Earth when the number of species was increasing with very high speed. This era was approximately 541 million years ago, and the end of this era was caused, that the number of animals and species was increasing. Those animals were eating the cells, what were the base of the ecosystem, and then the number of the cells were collapsed. Then the animals were dead in the first disaster on Earth. This is the major explanation for the first disaster and the beginning of the Ordovician period. But as we might know, all mass disasters are causing because of the many reasons, and the decrease of food might cause also because the Oxygen was released into the water. The first organisms were anaerobic, and they were quite similar to the organisms that live near the "Black Smokers" in the deep under the ocean surfa...