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Evolution of Multicellularity
Rulers of the Earth had many key transitions in their path to taking over the world. Plants, animals, and fungi all have these things in common. They rule the world. They all love low volume funk music. And they are multicellular (mostly). These behemoths of lifeforms pack cell specialization, where labor is divided and given to cells dedicated to performing specific tasks. These are exemplified by muscle cells in the animals, whose whole morphology developed to “pull on the body and move it a certain direction.” Multicellularity was a game changer in a world dominated by microbes like bacteria and protists. When single celled protists started living in colonies, a form of society emerged. Just like human society, when they started out, multicellulars weren't as complex as they are today. Remnants of ancient human societies live on today and they still carry on their traditions, but because of the development to the modern world, they have changed. Likewise, remnants of ancient protist societies still live on today and we can study them to learn more about how the features of multicellularity evolved. This is akin to looking at the traditions of modern Māori communities in order to understand their Polynesian ancestors. But sadly, many intermediates between ancient and new societies have gone extinct. We can only learn with what we have. For studying the evolution of animals, we have Choanoflagellates, the Filastereans, and sponges among other model organisms. If you're interested in this topic, I've linked research papers below for you especially.

Why am I so interested in multicellularity? It contains many nuggets of interesting developments in living systems. Multicellularity has implications. You become a living environment for others to live on and in. You can evolve specialized structures that aren't limited to micrometer scales. You can develop strong extracellular materials that prevent drying out. You can rule the land or sky. The road to intelligence requires multicellularity as a key transition. One of the things I pursue is a new biology. And that can be given in two ways: synthetic life or undiscovered life. For those wanting to create or find intelligent life, multicellularity is something you must generate or look for. It requires living systems to be social with each other to accomplish a greater task.

The border between unicellularity and multicellularity is a rough one. It brings philosophical problems not debated in the scientific method. Are we just colonies of clonal cells, each striving to survive but limited by the whole colony? Cancer is an interesting case study where cells mutate and begin to act on their own, breaking free of programed societal restrictions. Its survival takes over to the detriment of the colony. But we must learn how multicellulars evolve to understand what can be used to connect living systems. How may we mimic these requirements in unicellulars to convince them to become more social? Fast artificial evolution to multicellularity? There are many things to look at. As I said before, multicellularity has great implications.

Interesting reviews on this topic:
origin of animals from a unicellular perspective
origin of animal multicellularity and cell differentiation
multiple origins of complex multicellularity
OoM and early history of the genetic toolkit For animal development