>>13401162Anyway, cesium doesn't accumulate in particular, and is about as toxic as salt is. It seems that some fungy may accumulate it for purpose.
Plutonium is too rare in nature to make anything specific use likely.
Uranium is too ubiquitous to pose a danger, everything had to evolve with its presence in mind. It could even have uses in nature, especially in its uranyl form.
Lead is widespread and natural, and has documented uses in proteins, which is beimg vehemently denied, and its absence causes blindness, mqlformed bones and insanity.