Question

oxygen is an important gas in the atmosphere, making up about 21% of the entire atmosphere. which of these describes the importance of oxygen? it is vital for blocking harmful ultraviolet (uv) radiation from the sun. it is vital for animal respiration, allowing them to breathe and survive. it is vital for plant growth and the process of photosynthesis. it is vital for creating clouds and contributing to weather patterns.

Explanation:

• Option 1: Ozone (not oxygen) blocks UV radiation. So this is incorrect.
• Option 2: Animals use oxygen in respiration (breathing) to produce energy, which is essential for their survival. This is correct.
• Option 3: Plants produce oxygen during photosynthesis and use carbon dioxide, so oxygen is not vital for photosynthesis (plants need CO₂ for that). This is incorrect.
• Option 4: Water vapor and other atmospheric processes (not oxygen) are key for cloud formation and weather. This is incorrect.

Answer:

B. It is vital for animal respiration, allowing them to breathe and survive.