..."In the last half century we have discovered a *dozen*
micronutrients to be essential in animal nutrition --- molybdenum,
selenium, and chromium in the 1950s; nickel in the 1960s'; fluorine,
tin, vanadium, silicon, arsenic, cadmium, and lead in the 1970s"...
fLUORINE,Arsenic, Cadmium, and Lead are essential micronutrients????
I dont get it, I thought these were heavy metals (later 3)and a severe
chemical disruptor( fluorine)?
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