Final answer:
Producers in habitats without sunlight obtain nutrients through ocean upwelling and chemosynthesis.
Step-by-step explanation:
Producers in habitats that are not exposed to sunlight, such as the deep sea, obtain nutrients through two main processes: ocean upwelling and chemosynthesis. Ocean upwelling occurs when deep ocean waters rise to the surface, bringing with them nutrients from dead organisms that sank to the bottom. These nutrients become available for reuse by other living organisms. Chemosynthesis is another process used by bacteria in the deep sea. These bacteria convert inorganic compounds, such as hydrogen sulfide, into organic matter to produce food, instead of relying on sunlight.