What major innovation of the three radiations was associated with defying gravity to facilitate life on land?

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Stems allowed plants to grow tall and reach for sunlight, which helped them to defy gravity and survive on land. This was a major innovation that enabled plants to colonize new habitats and diversify. Waxy coverings, insect pollination, and new sources of food were also important innovations, but they were not specifically associated with defying gravity.

What Major Innovation of the Three Radiations Was Associated with Defying