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.

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.