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Unlike gradualism, punctuated equilibrium involves

Aa slow change in evolution over time.
Bstable periods of change interrupted by rapidly occurring change.
Cspecies that are said to be in equilibrium.
Da steady change in evolution over time.

Verified Answer :

Neuron

Punctuated equilibrium has been a theory in evolutionary biology developed and coined by Stephen Jay Gould which talks about very rapid changes which occur in nature while on the other hand still having a lot of stable periods with plenty of change in general. 

The correct answer for that reason would be  B.

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