This is a possibility that shouldn't be dismissed. Trees use mycorrhizal networks to communicate and have been around for a very long time on this planet. They model the environment and use either a set of micro-decisions or a set of larger, slower moves that are made across longer timescales than humanity is used to. You can argue whether they possess sentience or not, but when discussing models, decisions, and consequences - trees seem to act with plenty of coordination and understanding and self-interest.
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