Lions and tigers are endangered as their generations are destroyed by many reasons
certain accidents may result in lessening the no of species .  characters are governed by zeans.  thus there is a change in the frequency of zeans and as a result inherited pramites are transmitted from parent to progeny.
the change in the non reproductive tissues cannot be passed on to the DNA of the germ cells.
therefore an individual cannot be passedon to its progeny and cannot affect direct evolution.  thus the no of lions and tigers may be regularly affected
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