Which is the most abundant atom (% body weight) in the human body? ( )
A: Hydrogen
B: Oxygen
C: Carbon
D: Nitrogen
A: Hydrogen
B: Oxygen
C: Carbon
D: Nitrogen
举一反三
- （ ）is the most abundant chemical element in plants and animals. A: Oxygen B: Carbon C: Hydrogen D: Nitrogen
- Scientists figured out that human bodies are basically made of（） A: hydrogen, carbon, nitrogen, and oxygen atoms B: water vapor, ammonia, carbon dioxide, methane and hydrogen C: biomolecules and water D: evolutionary molecules
- Which is the most abundant and most important immunoglobulin in human body?____ A: IgG B: IgA C: IgM D: IgE E: IgD
- ( ) is taken in by plants to make food. A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide