Question 5

(Multiple Choice)

About 25 of the 92 natural elements are known to be essential to life.Which four of these 25 elements make up approximately 96% of living matter?


A)carbon, sodium, hydrogen, nitrogen
B)carbon, oxygen, phosphorus, hydrogen
C)oxygen, hydrogen, calcium, nitrogen
D)carbon, hydrogen, nitrogen, oxygen
E)carbon, oxygen, nitrogen, calcium

Answer