Answer the following question given this paragraph: 

Fires, which are a natural disturbance in temperate grasslands, can be ignited by lightning strikes. It also appears that the lightning-caused fire regime in North American grasslands was enhanced by intentional burning by humans. When fire is suppressed in temperate grasslands, the vegetation eventually converts to scrub and dense forests. Often, the restoration or.


Q: Which type of natural disturbance in temperate grasslands, can be caused by a lightning strike?


A:
fire