Short answer: No. There is life on Earth that does not require or use the Sun as its basic energy supplier. In deep ocean environments there are animals that use the thermal ports of underwater volcanoes to supply their energy needs.
the source for all enery is sunlight
A source of Energy.
It is the sun.
Food chains exist on the land and in the sea. Tiny plants in the oceans are the ultimate source of food for all sea creatures.
the sun is the beginning of all food chains
The Sun is the primary source of all energy in nearly all food chains. However, some deep-sea ecosystems utilize heat from underwater thermal vents as their primary energy sources since sunlight is virtually nonexistent.
The sun is the energy source that provides heat and light for all of Earth's food chains through the process of photosynthesis. Solar energy is converted into chemical energy by plants, which is then transferred through the food chain to sustain life on Earth.
Sunlight
The ultimate energy source for all food chains is the sun. Plants use sunlight to photosynthesize, converting solar energy into chemical energy that is passed on to herbivores when they consume the plants. This energy then moves up the food chain as animals consume other animals.
Without the producers, the food chains could not exits.
food web
If decomposers were not t the end of all food chains then the food chains would not be able to work. This is because the nutrients would not be returned to the producers.