When Did Marine Invertebrates First Appear?
Aug 2025 · GM Kids Series 576 Book 144 · GOS Education Inc.
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Marine invertebrates appeared more than 540 million years ago.
Around 540 million years ago, during the Cambrian Explosion,
they became much more diverse and abundant.
Life forms increased rapidly during this special period.
The ocean had more oxygen, and the weather was warmer.
It was a great environment for new life forms to appear.
Marine invertebrates appeared more than 540 million years ago.
Around 540 million years ago, during the Cambrian Explosion,
they became much more diverse and abundant.
Life forms increased rapidly during this special period.
The ocean had more oxygen, and the weather was warmer.
It was a great en...
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