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Zero.

The current best estimate for the age of the universe is 13.75 billion years. The first trees are thought to date from the Carboniferous, approximately 359 - 299 million years ago.

As such, 400 billion years ago (roughly 1300 times older than the estimated point when trees first appeared on Earth and approximately 23 times older than the age of the universe) it is VERY unlikely that there were any trees at all.

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14y ago

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