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1. Carbon 2. Hydrogen
3. Oxygen 4. Nitrogen
A. 2 and 3
B. 1, 2 and 4
C. 1, 3 and 4
D. 1, 2, 3 and 4
Answer
D. 1, 2, 3 and 4
Submitted by: Toheed Ahmed
1. Carbon 2. Hydrogen
3. Oxygen 4. Nitrogen
A. 2 and 3
B. 1, 2 and 4
C. 1, 3 and 4
D. 1, 2, 3 and 4
Submitted by: Toheed Ahmed