Set 5: Command of Evidence (Intermediate)

Explanation

Answer: B

PASSAGE

The greenhouse effect: atmospheric gases trap heat from the sun. Without it, Earth would average -18°C. Enhanced greenhouse effect from human emissions causes global warming.

What is the natural greenhouse effect?

A. A harmful pollution process.

B. A life-essential process keeping Earth warm.✓ Correct

C. Caused entirely by human activity.

D. Cools the Earth.

Detailed Explanation

'Without it, Earth would average -18°C' = it keeps Earth warm.

Why others are wrong:

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Set 5: Command of Evidence (Intermediate)

Detailed Explanation