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Construct a hypothesis to explain why so many "hard bodies" showed up in the Cambrian Explosion.

Construct a hypothesis to explain why so many "hard bodies" showed up in the Cambrian Explosion.

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Cambarian explosion means sudden appearance of hard bodies in fossil rwcords in cambarian period Hard bodies mean fossil containing skeletal remains of complex organism. Prior to that only soft bodied organism remains were in fossils. Sudden appearance of hard bodies may be due to chemical changes in world oceans (increase in conc. Of oxygen). Or may be due to adaptation against oredation to protect themselves. Hard Skeleton provide protection against predators.

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