Final answer:
Among the options listed, iron (Fe) is the correct trace element required by humans and other vertebrates for the transportation of oxygen by hemoglobin in the blood.
Step-by-step explanation:
Trace Elements Required by Humans and Vertebrates
Trace elements are those required by organisms in very small, or 'trace' quantities for various physiological functions. Among the options provided, iron (Fe) is a trace element required by humans and other vertebrates. It is crucial for the function of hemoglobin in blood, which transports oxygen around the body. Other micronutrients or trace elements include zinc (Zn), copper (Cu), manganese (Mn), and others, each serving its own unique role within biological systems, such as being parts of enzymes or assisting in biochemical reactions.