1) Fires (bushfires/wildfires) are a natural occurrence in grassland communities. Discuss why it is an advantage or a disadvantage in the ecosystem, plants and animals. 

2. If agriculture on once-virgin tropical forest area were to stop, how would you speed-up the process of secondary succession so that tropical forest quickly returns?

Answers (based from the link provided):

1. Bushfires or wildfires are a natural phenomenon that happens spontaneously grassland communities; with this, it brings both advantages and disadvantages. Its advantages include the removal of low-growing underbrush, clean the forest floor of debris, open the ground to sunlight exposure, and nourishes the soil by its ashes. Reversing it, its disadvantages include soil damage, erosion, and eye/respiratory tract irritation to humans and animals.

2. In the mentioned scenario; if agriculture on once-virgin tropical forest area were to stop, the way to fasten the secondary succession process to let the forest quickly recover is to raise the levels of organic materials. It is done by planting crops of legumes and annual grasses to inject biomass and carbon dioxide below the soil surface. It can be done too by pushing the soil succession along by creating hot compost piles or vermicompost bins to speed up the breakdown of the materials.

Step-by-step explanation

Explanations go along with the provided answers:

1. Bushfires or wildfires are a natural phenomenon that happens spontaneously grassland communities; with this, it brings both advantages and disadvantages. Its advantages include the removal of low-growing underbrush, clean the forest floor of debris, open the ground to sunlight exposure, and nourishes the soil by its ashes. Reversing it, its disadvantages include soil damage, erosion, and eye/respiratory tract irritation to humans and animals.

2. In the mentioned scenario; if agriculture on once-virgin tropical forest area were to stop, the way to fasten the secondary succession process to let the forest quickly recover is to raise the levels of organic materials. It is done by planting crops of legumes and annual grasses to inject biomass and carbon dioxide below the soil surface. It can be done too by pushing the soil succession along by creating hot compost piles or vermicompost bins to speed up the breakdown of the materials.