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Which situation results in a characteristic that is
inheritable?
(1) A limb is lost when two marine organisms fight.
(2) A puppy learns to beg for food by watching
an older dog perform tricks.
(3) A gene is inserted into a bacterium, allowing
the organism to produce insulin.
(4) A random mutation causes the immediate
death of a microbe.

Answer :

The best option is that "(4) A random mutation causes the immediate
death of a microbe" although it should be noted that this is not always the case. 

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