（ ）is the most abundant chemical element in plants and animals.
A: Oxygen
B: Carbon
C: Hydrogen
D: Nitrogen
A: Oxygen
B: Carbon
C: Hydrogen
D: Nitrogen
举一反三
- Which is the most abundant atom (% body weight) in the human body? ( ) A: Hydrogen B: Oxygen C: Carbon D: Nitrogen
- The most abundant element amongst the following as found in plants is A: Carbon B: Nitrogen C: Iron D: Manganese
- ( ) 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
- 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