.What was early life in pre-Cambrian period? What changed to cause an explosion of life? What caused that change?
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Other bubbles are thought to have formed self-replicating substances by attracting chemicals from around them. Over time the two combined to produce energy-using, living cells. The earliest living organisms were microscopic bacteria, which show up in the fossil record as early as 3.4 billion years ago.
Oxygen fluctuations stalled life on Earth
Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion.
Environmental changes such as rising levels of atmospheric oxygen and an increase in oceanic calcium concentrations may have caused The Cambrian Explosion.
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