Biofuel is used to produce electricity by burning, and wood and straw are both examples of biofuels. Given these facts, what can be done to wood and straw to produce electricity?  among the following options:
- massive damage
 - It can be crushed
 - adding heat
 - It can be burned.
 - matter vibrating
 - It can be boiled
 - Plant growth is reduced
 - it can be chopped


 

    It can be burned.     