The stardust is a given. As for sunlight, all the energy including somewhat arguably geothermal (using the suns gravity to help form the earth and I guess radioactive material being formed by other stars) comes from the sun and gets converted into chemical energy you eat so you’re stardust animated by sunlight (mainly).
It comes from the sun. The plants get their energy from the sun and that is primarily what fossil fuels are made of. But even the bit that is from animals is still energy the sun sent to earth and plants consumed and stored and animals then ate. The entire world is powered by a fusion reactor that sends energy wirelessly over millions of miles.