what is its classification?
Elemental arsenic and arsenic sulfate and trioxide compounds are classified as "toxic" and "dangerous for the environment" in the European Union.
Arsenic
Elemental arsenic and arsenic sulfate and trioxide compounds are classified as "toxic" and "dangerous for the environment" in the European Union 
what is the difference between sea otters and seals UNANSWERABLE where are such otters found? Along the coasts of northern and eastern North Pacific Ocean. what is its scientific name? "Enhydra lutris" . who are its predators? Orcas, sea lions, bald eagles, great white sharks in the water and coyote s, and bears on land. do these otters have social structures? They tend to rest together in single-sex groups called rafts consisting of 10 to 100 animals. how do they forage? They take short dives to the sea floor, may turn over rocks in search of prey like fish , snails and other organisms. At times it amy also carry a rock in the pouch across its chest to break open shellfish and clams. who is the first person to describe them? Georg Steller. who is he? He was a naturalist. how does sea otter impact the economy? Sea otters are blamed for declines in shellfish harvest. However, they help the kelp harvesting industry and also pose as a major tourist attraction. in which religion does the above mentioned fish harvested have dietary restrictions? The Jews and the Seventh-day Adventists. mention a few toxic contents in it? Arsenic and toxins released by dinoflagellate. is the first content a chemical element? Yes, it is. is it used in treatment? It is used for locating tumors, for treating trypanosomiasis and other diseases. how much of it is legally allowed in foods? 23ppb for inorganic arsenic in apple and pear juices as per the limits set by the U.S. Food and Drug Administration.
wiki:1623952
Arsenic [SEP] Classification
Elemental arsenic and arsenic sulfate and trioxide compounds are classified as "toxic" and "dangerous for the environment" in the European Union under directive 67/548/EEC. The International Agency for Research on Cancer (IARC) recognizes arsenic and inorganic arsenic compounds as group 1 carcinogens, and the EU lists arsenic trioxide, arsenic pentoxide, and arsenate salts as category 1 carcinogens. Arsenic is known to cause when present in drinking water, "the most common species being arsenate [; As(V)] and arsenite [HAsO; As(III)]".