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Hydrogen
Radioactive elements used for fuel include Plutonium -239 Uranium-235 and uanium-233.
Uranium (U) Or Plutonium (Pu)
Two reasons:Weight. Batteries are heavier per energy unit than fuel cells.Capacity. Fuel cells can store much more energy than batteries.As a bonus, the weight for the fuel cell fuel reduces the weight of another required consumable: water. The "exhaust" of fuel cells is pure water which astronauts can drink.
Uranium or Plutonium For reactor fuel any Transuranic element works fine.
Uranium is the main fuel used, but in some countries a mixture of uranium and plutonium is also used (MOX fuel)
Hydrogen
racing
Californium
Uranium is a radioactive element used to fuel nuclear reactors. It is a nuclear fuel.
Th, element 90, spelled thorium, is an actinide and has been used as a nuclear fuel (see Wikipedia.)
The main system that serves the needs of individual cells in multicellular organisms is the circulatory system. This is used to take waste away from individual cells and bring in new fuel such as proteins, glucose, and oxygen.
yeast can be used to ferment starch, the result alcohol can be used as fuel
hydrogen
Anything that needs electricity can be fed from a fuel cell.Power vehicles
Fuel conversion cells are made from platinum and convert the material going through the device into heat and electric power (about equally). The element used is often hydrogen. Hydrogen comes from many places, but the practical commercially viable method in use is from stripping all other elements from natural gas. This means that the hydrogen used in most applications is a fossil fuel. This does not mean it must be this way though. Hydrogen could be obtained through the chemical stripping of water into hydrogen and oxygen. This would make fuel cells non fossil fuel based.
Glucose is the main fuel for glycolysis.