a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
one who refuses to serve in the armed forces on grounds of conscience
a state in west central United States in the Rocky Mountains
an odorless very poisonous gas that is a product of incomplete combustion of carbon
