The sun
most living things get their energy from the sun, though indirectly. the bottom of the food chain depends on plants, then other animals eat those animals. Through each layer there is less energy being passed along, because most of the energy comes from the sun (and water and oxygen that plants need to produce energy), and is converted into usable energy by plants and the like
Energy is required for living things because they have to have energy to do every other characteristic of life. Living things obtain energy by making it themselves or eating other organisms.
When bonds form during cell processes, energy is released.
When bonds form during cell processes, energy is released.
The role the sun plays is that it gives energy to different living organisms.
Fungi get their energy from living or dead organisms. They will usually specialize in living or dead and it is rare that they can do both.
They obtain their energy by consuming other organisms.
Chemosynthetic organisms obtain their energy directly from raw chemicals in their environment. Examples of this include tubeworms living next to hydrothermal vents.
Animals.
sulfur
They both obtain energy by consuming other organisms
the ultimate source of energy for all living organisms is the sun