Final answer:
A good web can exist in dark environments like the deep ocean, where certain bacteria use chemosynthesis to form the base of the food web, enabling a variety of life forms to survive without sunlight.
Step-by-step explanation:
A good web can exist in environments where there is no light, and producers are not photosynthetic, thanks to alternative methods of energy acquisition. Deep in the ocean, in places like hydrothermal vents, certain bacteria are able to perform chemosynthesis, extracting energy from inorganic chemicals due to the absence of light for photosynthesis. This process forms the base of the food web in such ecosystems, supporting a variety of life forms despite the lack of sunlight.
In the aphotic zone below 200 meters, sunlight is not available for photosynthesis, and hence, producers must either make 'food' via chemosynthesis or rely on organic material drifting from above. This showcases the diversity of life's adaptability in varying environments, ensuring the continuation of ecological processes and the survival of numerous species.
While ecosystems typically rely on photoautotrophs utilizing sunlight, these unique habitats demonstrate how life can adapt to utilize different energy sources, proving the resilience and versatility of biological systems.