Rare-earth elements are elements that are highly limited in supply, may be depleted (used up) within a short time, and are difficult to replenish. Examples include neodymium, samarium, and yttrium.
Paper can be replenished by recycling old papers, while solar energy and water are renewable energy sources because we can not use them up within the foreseeable future.
A single test won't put the definitive diagnosis of diabetes. This diagnosis is put on 3 conseccutive measurements and they all have to be more that 125.
