The following text discusses deep-sea hydrothermal vents.
Hydrothermal vents support ecosystems independent of sunlight. Chemosynthetic bacteria convert hydrogen sulfide into energy, forming the base of unique food webs. Giant tube worms, blind shrimp, and other organisms have evolved remarkable adaptations to thrive in extreme temperatures and pressures. The discovery of these communities revolutionized understanding of life's possible habitats.
What is the primary purpose of the text?
To argue for increased protection of deep-sea environments
To compare vent ecosystems across different oceans
To describe vent ecosystems and their scientific significance
To explain the technology used to explore ocean depths
Correct Answer: C
Choice C is the best answer. The text describes vent ecosystems (chemosynthesis, adapted organisms) and their significance (revolutionized understanding of habitats).
- Evidence: The text describes the ecosystem: "support ecosystems independent of sunlight," "Chemosynthetic bacteria," "Giant tube worms." It notes significance: "revolutionized understanding of life's possible habitats."
- Reasoning: The passage combines descriptive details with a statement of scientific importance.
- Conclusion: The purpose is to describe ecosystems and their significance.
💡 Strategy: Summarize: What is it? (Vents/Life) + Why does it matter? (Revolutionized understanding).
Choice A is incorrect because protection isn't advocated. Choice B is incorrect because oceans aren't compared. Choice D is incorrect because exploration technology isn't discussed.