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The Cambrian Explosion
Name
Course
Instructor
August X, 2022

The Cambrian Explosion
• An event involving the sudden emergence

of new organisms.
• Major phyla appeared during this event
that constitute modern animal life.
• Occurred during approximately 542-488
million years ago (Zhang & Shu, 2021).
• The beginning of the Paleozoic era.

[Illustration of the Cambrian Explosion]. EurekAlert. https://www.eurekalert.org/multimedia/724111

What Caused the Cambrian Explosion?
• Sudden increase in oxygen in the ocean.

• Oxygen levels likely reached near-modern
levels, allowing for life to be supported.
• Availability of nutrients in the seawater.
• Increased phosphorus in the environment
(Smith & Harper, 2013).
• Change in the seawater composition.
[Illustration of Earth’s atmospheric oxygen concentration around the Cambrian period]. Lumen
Learning. https://courses.lumenlearning.com/wm-biology2/chapter/the-cambrian-explosion/

• Increased calcium...