Weekly Insights for Thinkers

Science  Philosophy  Critical Thinking  History  Politics RW  AI  Physics  •  Evolution  Astronomy 30 Phil Book More…
Science  Phil  Cr. Think  Hist 

STORY

First Multicellular Animals

By Michael Alan Prestwood

Sun 12 Sep 2021
Published 4 years ago.
Updated 3 days ago.
Share :
640 million years ago, the first multicell animals were almost certainly just collections of types of cells and reproduced.

First Multicellular Animals

640 Million Years Ago (+/- 20 million)
Stable cell adhesion and tissue specialization

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)

— map / TST —

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, evolving analysis in an emerging AI era where the credibility of information is increasingly contested.
This Week @ TST
February 25, 2026
»Edition Archive
WWB Research….
1. Story of the Week
Alfred Korzybski
2. Quote of the Week
Live legal, moral, and fair.
3. Science FAQ »
What does neuroscience say about “identity?”
4. Philosophy FAQ »
Why do people confuse explanations with reality?
5. Critical Thinking FAQ »
What is worldview humility?
6. History FAQ!
What does history teach us about authoritarian rule?
Bonus Deep-Dive Article
Mindscape Framework
Scroll to Top