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They developed in shallow seas, making a wall causing the water closer to the land to evaporate leaving rock salt behind.
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This was the major cause of the mass extinctions during this period. This resulted in global cooling.
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They also develope armored plates that serve as protection
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The plants were very small and reproduced through spores
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It was the first and biggest of the three mass extinctions. It lasted for 200,000 years and wiped out 50% of Trilobites.
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It was the second of three mass extinctions. This one conicided with global drop sea level and a excursion of geochemical isotopes.
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It was one of three relativly minor mass extinctions during this period, affecting mostly conodonts (fish-like creatures)
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These Myriapoda start to walk on land in the form of millipedes and centipedes
