The metal present in blood is

Fill in the blanks : The metal present in chlorophyll is ………… and the metal present in Vitamin B_12 is ……….

Fill in the blanks: The protein present in blood is _________.

The metal present in vitamin B_12 is ............. and the metal present in chlorophyll is ............. .

The metal present in vitamin B_12 is ............. and the metal present in chlorophyll is ............. .

What are the metals present in alloy, bell metal ?

________ pigment is present in blood of mollusca

The buffer solution present in blood is

The respiratory pigment present in human blood is