Which fossil fuel should be available for the longest time if current usage continues?

The answer is d. when it begins to fall back to the child's hand

Plants take energy from the sunlight with the of chlorophyll so the plant starts the food chain. then an herbivore eats the plant and gets its energy.then a carnivore or a human eats the herbivore and gets its energy. : )

There would be no evaporation so no water cycle