The burning of a log releases the logs chemical_energy into other forms of energy

When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.

Explanation:

a. is the answer because they are not shared

it takes about 30 days for it to break down