Yes, the nerve cells in living things use electricity to function, and lightning is natural electricity. There are natural earth currents in the ground and air that are generated by the interaction of Earth's magnetic field with the solar wind.
There are a lot more examples, including electric eels, which can generate substantial electric charges in their bodies.
No, electricity is not a mineral. Minerals are naturally occurring inorganic substances with a specific chemical composition and structure, while electricity is a form of energy produced by the movement of charged particles.
Matter can exist in four forms: plasma, gas, liquid, solid.
Onions can be grown in any part of the world where temperature conditions exist that are suitable, whether naturally or in greenhouses.
There is no reason why a form of life doesn't exist on Mars. If life can exist in the very hot thermal vents deep in the earth's oceans, then why life in some form can't exist on another planet in some form?
Well the Roman Empire's economy doesn't exist anymore. The economy of the fabled Atlantis doesn't exist anymore. Any civilization, society, or nation that does not exist anymore (naturally) there economy is also non-existent.
Fluorine is the only halogen that does not naturally exist in any positive oxidation state. The other halogens - chlorine, bromine, iodine, and astatine - can exist in various positive oxidation states, though they are less common in nature compared to their negative oxidation states.
Man has not "made" any eleents, but many of the elements on the periodic table do not naturally occur in their purist form in the crust, and some are so unstable that they can only exist for a few seconds after we have produced them in a reaction.
Any solid metal plus liquid mercury in their elemental form.
Yes, it is the only naturally occurring Uranium isotope that can be used, in fact it is the only naturally occurring isotope of any element that can be used and occurs in large enough quantities to be practical to use.
Bioenergy just means that it comes from biological things. Once you have this energy in some useful form (for example, electricity), you can use it for anything where you can use any electricity from any other source.
lactose is a naturally occurring sugar, and has all the same benefits as any other form of glucose.
Society wouldn't exist without any form of invention.