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The colonial theory
There is a hypothesis that multicellular life formed from flagellates aggregating.
Dictyostelium discoideum
A weird amoeba which behaves like an multicellular slug, multicellular fungi, or a single celled amoeba, depending on the phase of its life cycle. Answers the question: how to make a fungi from 4 types of cells?
Volvocine green algae
Evolutionary time machine model lineage for studying multicellularity, a beautiful representation of possible multicellular plant origins.
Trichoplax
A simple multicellular animal with no symmetry, made out of only six types of cells. Come on now, only six? This is doable!
Biofilms
Bacteria can get together to throw a party, multiply then spread even more!