On land, the continents were barren and rocky, with few signs of life. However, some evidence suggests that primitive fungi and lichen may have existed on land at the time. These early life forms played a critical role in breaking down rocks and releasing nutrients into the soil, which helped pave the way for more complex plant life to emerge later. In terms of the Earth's geology, the Proterozoic Eon was marked by significant tectonic activity. The Earth's crust was still undergoin...