If I remember that abiotic means not living then rocks, soil, air.
The triangle is an Acute angle triangle.
Its is to remove liquid waste from the blood in the form of urine, and keep a stable balance of salts and other substances in the blood and produce erythropoietin, hormone that is the formation of ref blood cells. The kidney remove ursa from the blood through this filtering units called nephrons
Sulfur has six valence electrons, meaning that each atom of this element has six electrons in its outermost shell.
