How did single celled organisms evolve into multicellular organisms?

Question

I feel like this part of evolution is kind of skipped over by historians. The more I think about it the more it hurts my brain

In: Biology

Answer 1

It’s not skipped over. We have living examples of transitional forms between single-celled and complex multicellular organisms. Some sponges are basically just colonies of undifferentiated cells held together by a collagenous matrix.