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First Multicellular Animals

By Michael Alan Prestwood

Author and Natural Philosopher

Sun 12 Sep 2021
Published 4 years ago.
Updated 2 years ago.
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First Multicellular Animals

640 Million Years Ago
640 to 600 Million Years Ago

Organisms that consist of more than one cell took several billion years to evolve from unicellular organisms. All species of animals, land plants and most fungi are multicellular, as well as many algae. A few organisms are partially both such as slime molds and social amoebae.

  • Domain: Eukaryota > Kingdom: Animalia > Phylum: Porifera (sponges)
Michael Alan Prestwood
Author & Natural Philosopher

Prestwood writes on science-first philosophy, with particular attention to the convergence of disciplines. Drawing on his TST Framework, his work emphasizes rational inquiry grounded in empirical observation while engaging questions at the edges of established knowledge. With TouchstoneTruth positioned as a living touchstone, this work aims to contribute reliable analysis in an emerging AI era where the credibility of information is increasingly contested.

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WWB Menu
7 Jan 2026
Essay of the Week
The Architecture of Change: Finding Stability in Flux
Story of the Week
Heraclitus
Quote of the Week
“Everything is in flux.”
Weekly Crossroads!
1. Science »
Will the night sky have stars nearly forever?
2. Philosophy »
What does existence before essence mean?
3. Critical Thinking »
Is cause and effect certain?
4. History!
Who were the Presocratic Philosophers?
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