Final answer:
Fossils formation, Cambrian explosion, Mass extinction explained.
Explanation:
Fossils are formed through a process called fossilization. This occurs when a dead organism is buried in sediment, which eventually hardens into rock, preserving the organism's remains. Fossils provide valuable insights into past life forms and Earth's history.
The Cambrian explosion refers to a period in Earth's history around 541 million years ago when there was a sudden burst in diversity of life forms, particularly in marine organisms.
Mass extinction events are periods in the Earth's history where a significant number of species go extinct in a relatively short time, often due to catastrophic environmental changes or events.
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