Which One of the Following is a Primary Component of BOTH

Question

Which one of the following is a primary component of BOTH living organisms and the Earth's crust?
A)silicon
B)hydrogen
C)oxygen
D)carbon
E)nitrogen

Accepted Answer

Oxygen is a primary component of both living organisms and the Earth's crust. It makes up about 65% of the human body and is a key element in many important biological molecules. Oxygen is also the most abundant element in the Earth's crust, making up about 47% of the crust by weight.