▪️It is called as law of irreversibility.
▪️ It states that an organism never returns exactly to a former state, even if it finds itself placed in conditions of existence identical to those in which it has previously lived.
▪️it always keeps some trace of the intermediate stages through which it has passed.
▪️It simply means that evolution always moves forward and an organism cannot redevelop an organ or attribute discarded by its ancestors
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