Iodine.
Scientists synthesise elements to discover more about chemistry and physics. If we didn't carrying on with research, we would never discover anything scientifically. It's all about extending our...
iodine
Thyroid hormones T4 and T3 contain molecules of iodine. The number 3 or 4 tells how many iodine molecules the hormone contains.
Nitrogen and Hydrogen.
oxygen,,,flammable material,,,,,and,,,,i don know