Final answer:
The use of both organic and inorganic forms of carbon is known as mixotrophy, a metabolic strategy that offers flexibility to organisms in diverse environments.
Step-by-step explanation:
The simultaneous use of both organic and inorganic forms of carbon is called mixotrophy. This nutritional strategy is one where organisms can obtain energy and carbon through a mix of autotrophic and heterotrophic means. In other words, mixotrophs are capable of using inorganic sources of energy, like sunlight or inorganic compounds, while also being able to use organic substances. This diverse approach to metabolism allows mixotrophs to thrive in various environmental conditions where the availability of nutrients may fluctuate.