Law of Irreversibility
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Dollo's law of irreversibility (also recognized as Dollo's principle or Dollo's law), postulated by Belgian paleontologist Louis Dollo in 1893, asserts that an organism never gets back identically to a former state, even if it uncovers itself put in conditions of life equivalent to those wherein it has originally settled. It always keeps some trail of the various intervals through which it has passed.
There are some intermediate steps that the organism has passed through during its lifetime...























