Final answer:
The Cambrian Explosion, unresolved questions, and mass extinctions in evolution are pivotal topics in the history of life on Earth.
Explanation:
The Cambrian Explosion was a pivotal event in the history of life on Earth, marked by a rapid diversification of animal phyla over a relatively short period of time. This phenomenon is attributed to several factors such as increased atmospheric oxygen levels and ecological interactions like predator-prey dynamics.
Unresolved questions surrounding the Cambrian explosion include the exact triggers that initiated this burst of biodiversity and the role of genetic and environmental factors in driving this evolutionary leap.
Mass animal extinctions throughout evolutionary history have shaped the course of life on Earth, acting as both setbacks in terms of loss of diversity and opportunities for new species to emerge and thrive.
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