Question

which statements describe the importance of the nitrogen cycle to living things? select two options.
it provides a source of water.
it helps cells make proteins.
it provides a form of usable nitrogen.
it removes carbon dioxide from the atmosphere.
it destroys harmful bacteria.
it helps cells make glucose.

Explanation:

1. Analyze each option:

• "It provides a source of water": The nitrogen cycle is about nitrogen, not water, so this is incorrect.
• "It helps cells make proteins": Proteins contain nitrogen, and the nitrogen cycle provides usable nitrogen for protein synthesis, so this is correct.
• "It provides a form of usable nitrogen": The nitrogen cycle converts atmospheric nitrogen into forms (like ammonia, nitrates) that living things can use, so this is correct.
• "It removes carbon dioxide from the atmosphere": The nitrogen cycle doesn't involve carbon dioxide removal (that's related to the carbon cycle or photosynthesis), so this is incorrect.
• "It destroys harmful bacteria": The nitrogen cycle doesn't focus on destroying bacteria; some bacteria are part of the cycle (like nitrogen - fixing bacteria), so this is incorrect.
• "It helps cells make glucose": Glucose is a carbohydrate with carbon, hydrogen, and oxygen; nitrogen isn't involved in glucose synthesis, so this is incorrect.

Answer:

B. It helps cells make proteins, C. It provides a form of usable nitrogen