What is the relationship between iron, rbc, hemoglobin, and oxygen

Red blood cells have hemoglobin proteins in them; 95% of RBC’s dry matter is hemoglobin. Hemoglobin is a tetramer protein with iron cofactors in it. The iron enables the RBC hemoglobin to carry oxygen. Oxygen oxidized the iron for Fe2+ to Fe3+ and is carried to the oxygen-deficient region in the body. The oxygen is released and the Fe3+ reverts to Fe2+.  The hemoglobin changes conformity when it binds oxygen.

true is the answer : )

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;