Answer:
Secondary succession.
Step-by-step explanation:
Succession is the change in the composition of the species with respect to the time. Two main types of the succession are primary succession and secondary succession.
Secondary succession may be defined as the succession that occurs on the lands that has earlier been destroyed by the human and natural action. The healthy grassland ecosystem that has been destroyed by the fire, shows the secondary succession. This succession is faster than primary succession.
Thus, the answer is secondary succession.