Because it gives light.
The sun is not considered to be a primary consumer. The sun is an energy source that is used by primary consumers.
The main source of energy is usually considered to be the energy absorbed from the sun (E.G., used in photosynthesis).
solar energy will never run out because, the sun never runs out of energy.
because it has vitamin a
Without the Sun, the Earth would be a lifeless, cold, dark, planet. The Sun provides thermal and radiant energy for the Earth.
all energy on Earth ultimately comes from the sun.
It converts the light energy from the sun into chemical energy in the form of glucose, which can be used by the plant.
because plants get their energy from it and everything else gets their energy from plants
yes because its a ball of hot gases
Energy cannot be created, not even in the Sun. If saying that the Sun is a "source" of energy gives you this impression... well, it doesn't actually create the energy. It only converts energy - from the potential energy (nuclear energy) available in the hydrogen-1, which is the fuel the Sun uses. Once it uses its fuel up, there will be no more. If anybody says the Sun is a "source" of energy, that simply means we get the energy from the Sun. This sort of statement doesn't analyze in more detail where the energy comes from.
The sun gives off electromagnetic radiation (solar energy). This comes in a variety of flavors: ultraviolet, infrared, visible light, etc.
No, the sun cannot be considered a perpetual motion machine. Scientists and astronomers have found other stars that used to be suns but have now lost the energy required to "operate". Our sun will eventually run out of energy and will stop producing heat for our planet.