Answer:
C) photoautotroph - CO₂
Explanation:
Organisms are classified based on how they get (source) their energy and carbon. Autotophic organisms or simply autotophs are organisms capable of synthesizing their own food in form of organic molecules while heterotrophic organisms (heterotrophs) are not capable of synthesizing their food, hence they are dependent on other organisms for carbon source.
Autotophs can either be photoautotrophic or chemoautotrophic depending on whether they use light energy from sun or chemical energy from the oxidation of inorganic molecules e.g. Fe²⁺, as sources of energy respectively.
Also, Heterotrophs can either be photoheterotrophic or chemoheterotrophic depending on whether light from sun or chemicals from organic molecules like carbohydrates is used as source of energy respectively.
Hence, option C is wrong as photoautotrophs use light as source of energy not CO2. CO2 is rather a carbon source.
