Put the following elements in order of abundance by weight in living organisms, starting with the most abundant, and ending with the least abundant: iron, copper, phosphorus, oxygen, and hydrogen.
A - hydrogen, oxygen, iron, phosphorus, copper
B - oxygen, hydrogen, phosphorus, copper, iron
C - oxygen, phosphorus, hydrogen, iron, copper
D - hydrogen, oxygen, phosphorus, copper, iron
E - oxygen, hydrogen, phosphorus, iron, copper
Answer: E - oxygen, hydrogen, phosphorus, iron, copper