Biology

The correct answer is: C.Transitional forms between species.

Explanation:

According to the theory of punctuated equilibrium, evolutionary changes happen in short bursts, followed by long periods of stability. Because these bursts of change are relatively rapid, transitional forms (the intermediate fossils that show gradual change between species) are less likely to be found in the fossil record. This is because the changes happen quickly, often before the species has time to leave many intermediate fossil forms.