Concept:Chemosynthetic organisms make their own food by obtaining energy from the oxidation of simple inorganic substances.
Explanation:Chemosynthesis is the process used by some bacteria to produce organic food molecules.
Unlike photosynthesis, it does not rely on sunlight for energy.
These organisms oxidise inorganic compounds such as hydrogen sulphide (
H2S), ammonia (
NH3), or hydrogen gas (
H2).
This oxidation releases chemical energy.
The organism then uses that energy to convert carbon dioxide (
CO2) and water into glucose and other organic substances.
Therefore, the entire process of manufacturing food depends on oxidation reactions.
Answer:A. oxidation