AUTHOR=Rose Caroline J. , Hammerschmidt Katrin TITLE=What Do We Mean by Multicellularity? The Evolutionary Transitions Framework Provides Answers JOURNAL=Frontiers in Ecology and Evolution VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2021.730714 DOI=10.3389/fevo.2021.730714 ISSN=2296-701X