Final answer:
Snails and Elodea interact to transfer carbon in a controlled environment through the consumption of detritus and photosynthesis.
Step-by-step explanation:
In a controlled environment, the transfer of carbon can be investigated through the interaction between snails and Elodea, an aquatic plant. Snails feed on detritus on the ocean bottom, which contains organic matter that includes carbon. Elodea, on the other hand, performs photosynthesis and converts carbon dioxide into organic compounds. When snails consume the detritus, they are ingesting carbon-containing organic matter. If the snails are then eaten by other organisms, the carbon is transferred through the food chain.