Before the Cambrian period, there was such low amount of oxygen for active animals to survive. During the Cambrian period there was a rapid increase of oxygen in the water which is believed to be the direct result of the phenomenon called the snow ball earth During the long period of recurring ice ages. When the glaciers would melt, rocks were exposed and eroded, which then poured nutrients in the water causing photosynthetic algae and later causing oxygen levels to rise. After the increase of oxygen levels, many active organisms where able to survive and increase rapidly and diversify in so many different
Before the Cambrian period, there was such low amount of oxygen for active animals to survive. During the Cambrian period there was a rapid increase of oxygen in the water which is believed to be the direct result of the phenomenon called the snow ball earth During the long period of recurring ice ages. When the glaciers would melt, rocks were exposed and eroded, which then poured nutrients in the water causing photosynthetic algae and later causing oxygen levels to rise. After the increase of oxygen levels, many active organisms where able to survive and increase rapidly and diversify in so many different