bristleworm

Polychaeta () is a paraphyletic class of generally marine annelid worms, commonly called bristle worms or polychaetes (). Each body segment has a pair of fleshy protrusions called parapodia which bear many chitinous bristles called chaetae, hence their name. More than 10,000 species have been described in this diverse and widespread class; in addition to inhabiting all of the world's oceans, polychaetes occur at all ocean depths, from planktonic species living near the surface, to a small undescribed species observed through ROV at the deepest region in the Earth's oceans, Challenger Deep.

L'arsenic est l'élément chimique de numéro atomique 33, noté par le symbole As. Son corps simple se présente sous la forme d'un solide cristallin argenté. L'arsenic appartient au groupe des pnictogènes (groupe 15) avec l'azote (N), le phosphore (P), l'antimoine (Sb), le bismuth (Bi) et le moscovium (Mc).

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