Which two of the following elements are abundant in the Earth's crust,but missing from the human body: O,Al,Si,Fe,C,N?

Name: Which two of the following elements are abundant in the Earth's crust,but missing from the human body: O,Al,Si,Fe,C,N?
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Aluminum (Al) and Silicon (Si) are both abundant in the Earth's crust, but are not commonly found in the human body. The other elements listed (Oxygen, Iron, Carbon, and Nitrogen) are all found in both the Earth's crust and the human body.

Which Two of the Following Elements Are Abundant in the Earth's