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Set 3: Inferences

Explanation

Answer: B

PASSAGE

Certain bacteria living in deep-sea hydrothermal vents survive without sunlight by converting chemicals from the vents into energy—a process called chemosynthesis. These bacteria form the base of unique ecosystems completely independent of photosynthesis.

What can be inferred about life in hydrothermal vent ecosystems?

A. All life requires sunlight to survive.
B. Energy sources other than sunlight can support complex food webs.✓ Correct
C. Hydrothermal vents are too hostile for any life forms.
D. These bacteria are identical to surface bacteria.

Detailed Explanation

Bacteria use chemosynthesis (not photosynthesis) to create energy, and they 'form the base of ecosystems'—proving non-solar energy can support life.

Key Evidence:

• "converting chemicals into energy"

• "base of unique ecosystems"

Why others are wrong: A (These organisms live without sunlight.), C (Life exists there—bacteria and ecosystems.), D (Chemical energy use makes them distinct.).

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