( ) is taken in by plants to make food.
A: nitrogen
B: hydrogen
C: oxygen
D: carbon dioxide
A: nitrogen
B: hydrogen
C: oxygen
D: carbon dioxide
D
举一反三
- The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- （ ）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
- The synonym of CO2 is .（ ）。 A: hydrogen B: carbon monoxide C: carbon dioxide D: oxygen
- "Greenhouse gases" in Para. 2 refer to ________________. A: oxygen B: hydrogen C: carbon dioxide D: air
内容
- 0
Which is the most abundant atom (% body weight) in the human body? ( ) A: Hydrogen B: Oxygen C: Carbon D: Nitrogen
- 1
（ ） is taken in by plants to make food.
- 2
（ ） is taken in by plants to make food.
- 3
Which is not the feature of life? A: They have the ability to propagation. B: They have the active ability to change themself to adapt to the environment. C: They are mainly made up of carbon, hydrogen, oxygen, nitrogen, etc. D: They must have the ability to make and use tools
- 4
Carbon dioxide consists of carbon and （ ） A: oxygen B: emergency C: upgrade D: religious