Given below are two statements.
Statement I: Photosynthesis is a physico-chemical process shown by all living organisms.
Statement II: Photosynthesis is the primary source of food and oxygen on Earth.
In light of the above statements, choose the correct answer from the options given below.

Photosynthesis is a physico-chemical process shown by only autotrophs. Heterotrophs are organisms that cannot produce their own organic molecules through photosynthesis or other inorganic carbon fixation processes. Instead, they rely on obtaining organic compounds, such as sugars, amino acids, and fatty acids, from other organisms.