iÂ·onÂ·ic bond. A chemical bond formed between two ions with opposite charges. Ionic bonds form when one atom gives up one or more electrons to another atom. These bonds can form between a pair of atoms or between molecules and are the type of bond found in salts.
The answer is supernovae. In a supernova explosion, neutron capture reactions take place (this is not fusion), leading to the formation of heavy elements. This is the reason why it is said that most of the stuff that we see around us come from stars and supernovae (the heavy elements part).
Iron is an important component ofhemoglobin, myoglobin and a number ofenzymes. Hemoglobin is found in red blood cellsand carries oxygen to the body tissues. Myoglobin carries oxygen from the blood to themuscle cells. Seventy percent of the total ironfound in the body is in hemoglobin, myoglobin,and enzymes. The remainder is stored in the bonemarrow (where red blood cells are made), liverand spleen.The other minor minerals also known as traceminerals are covered well in HE3-230, TraceMinerals in Your Diet.