Final answer:
Life first began to evolve onto land during the Ordovician Period.
Step-by-step explanation:
The first appearance of life on land occurred during the Ordovician Period (505-440 million years ago).
During this period, the ancestors of modern land plants colonized the land for the first time. This colonization is marked by the presence of fossilized cells, cuticles, and spores of early land plants.
This event occurred before the Silurian and Devonian Periods when further developments in plant and animal life on land took place.