Part 6/14:
Despite the myriad of potential environments suitable for abiogenesis, the precise conditions remain elusive. Consequently, this remarkable event stands as one possible Great Filter, one that raises questions about whether it occurs frequently in the universe or if we were extraordinarily lucky.
Following the emergence of unicellular organisms, life evolved slowly towards multicellular forms over billions of years. This transition entails an immense generational turnover, with unicellular life reigning on Earth for approximately three billion years before multicellular organisms flourished. The sheer scale of evolutionary time underscores significant barriers that life must surmount in its journey towards complexity.