Object Hierarchies
An object hierarchy lets you create relationships between objects.
A hierarchy adds structure to the objects in your scene. This can make arranging and animating objects much easier. When you're arranging objects, a hierarchy can make positioning and rotating easier since you can transform an entire hierarchy all at once instead of separately. The same is true for animating. You can quickly create motion animations by changing the position of a parent object, since its children will move with it.
Hierarchies can be created by either grouping or linking objects.
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