Final answer:
During the Ordovician period, plant life first appeared on land, influencing the transition of aquatic animals to terrestrial environments.
Explanation:
During the Ordovician period, plant life first appeared on land, marking a significant event in the evolution of land plants. This colonization of land by the ancestors of modern land plants paved the way for the transition of aquatic animals to terrestrial environments. Fossil evidence, including cells, cuticles, and spores, dating back to the Ordovician period, supports this milestone in plant evolution.
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