Why the first land plants lacked leaves for 80 million years

When It Was Too Hot for Leaves · 11:04 · Video: PBS Eons · Watch at the source

In short: Explore the early history of terrestrial life and discover the environmental barriers that prevented plants from developing leaves during their first 80 million years on land.

While plants began colonizing land at least 470 million years ago, the familiar structure of leaves was notably absent during their initial era. This video examines the factors that prevented the evolution of leaves as we recognize them today during those first 80 million years of terrestrial plant life.

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