Identify and describe four crucial events in evolutionary history without which our current existence would have been highly unlikely. Explain your reasoning clearly.

FOUR CRUCIAL EVENTS IN EVOLUTIONARY HISTORY
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Science in a unique way describes the world based on series of events and activities that can be retrieved from confirmable data. Evolution history is an interesting piece that explains how life came into being since three and a half billion years ago. There are four pivotal occurrences which define evolution, they include:
The Cambrian Evolutionary Radiation
According to Collins (1996), the origin of Cambrian evolution which started with Walcott’s uncovering of Burgess Shale. In it, there is a distinguished well-kept Cambrian fossil worldwide (Collins, 1996). These discoveries use the knowledge of the next appearance of fossils to define the biogeographical that defines interactable correlation and stability difficulties. It is characterised with chronic biofacies control and regionalism of taxa which encompasses a stable lower chronostratigraphy.
The End-Permian Mass Extinction Event.
It was manifested through the abolishment of 95% of the marine lives and 70% of the earth-bound species, Lepore (2012) states that almost half of the taxa families available by then disappeared this was as a result of temperature crises, alteration of the carbon circle and larger population of methane explosion producing microbes. After most of the animals were all dead, the remaining population constitutes the current community.
Evolution of Limbs from fins and pedestrianisation
It defines how fish evo…