The original source of the matter in food

Sunlight? im not sure what the question you are trying to answer is

Explanation:

I think your asking what is the original source of the matter in food

Explanation:

if so The Sun is the major source of energy for organisms and the ecosystems of which they are a part. 

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs