Answer 4 :: "sequential"

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Tree embodies development in time & has "archival" function.

Answer 3 :: "functional"

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Functional morphisms (upwards & downwards "flow", "bifurcations", "supply" )

Answer 2 :: "structural"

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Structural morphisms (roots, branches etc.)

Answer 1 :: "conceptual"

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Both organic and digital trees are human concepts (results of activity of analytical Mind).

Answer0 :: "partitioning"

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Both organic and digital trees divide "the space" into partitions.