The rings in a tree are a function of its age.
The height of a tree is a function of its age.
The bark on a tree is a function of its species.
The amount of sap in a tree is a function of its size and type.
The direction of branch growth is a function of the direction and amount of sunlight.
The fruit on an apple tree is a function of its health.
The color of leaves on a tree is a function of the season.
The type of tree is a function of the surrounding environment.
The amount of shade created by a tree is a function of its size.
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