Illegal or "underground" earnings from crime or from untaxed (undeclared) work or activity are

Underground earnings or illegal earnings from the crime committed by a person or from untaxed (undeclared) activity or work are considered as income. We can considered it as income because it comes from your hard work, crime specially theft is also comes from hard work. So it is also considered to be INCOME.

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Interacting group of various species in a common location. for example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.