Cambrian evolution took place about 541 million years ago. Sudden increase in Oxygen in the Ocean helped the complex organisms and predators to emerge. To survive among those predators, every species tried to develop complex body parts like shells, spines etc. Take for example Trilobites. They had flattened, segmented and plated bodies with spines to help them survive among the increasing number of predators in the sea.
Cambrian explosion refers to an important period in Earth history which mark the period which most animals first evolve in fossil record. It refers to emergence of organisms around 541 milion years. The Marine diversity of Cambrian explosion contain the fossils records of animals with shells. Scientists discovered rise in oxygen near ocean levels lead to Cambrian explosion.
The rise of canivorous predators in Cambrian explosion have promote new defence strategies and food diversity
