forest fires in mountain regions succession that transforms grassland to forest decomposition of a desert rodent flash flooding in a country area
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A student prepares a report on gradual environmental changes. Which is the best topic for this report?
Possibilities:
- forest fires in mountain regions
- succession that transforms grassland to forest
- decomposition of a desert rodent
- flash flooding in a country area

succession that transforms grassland to forest