Why is the acacia leaf difficult? Is it due to the arrangement of leaves, venation or what?

You can judge by the arrangement of the leaves. If a sheet, for example, consists of one plate, then it will accordingly be simple. Accordingly, if from several plates, then it is complex.
In this case, let’s look at acacia.
Acacia has a reticular venation and an opposite or whorled arrangement, and this is a characteristic feature only for complex leaves.



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