Why do some marine animals live in hydrothermal vents?
Quick Answer
Hydrothermal vent animals rely on bacteria that turn chemicals from the vents into food. This lets them live without sunlight in one of the deepest habitats on Earth.
The Full Story
Hydrothermal vents release hot, mineral-rich fluids from the seafloor, often along mid-ocean ridges. Around these vents, sunlight is absent, so the food web depends on chemosynthesis rather than photosynthesis. Bacteria use chemicals such as hydrogen sulfide as an energy source and support animals like giant tube worms, vent clams, and certain shrimp. This discovery in the late 1970s revolutionized biology because it showed that complex ecosystems can exist entirely without sunlight. Vent communities are isolated, extreme, and highly specialized, making them a major focus of deep-sea research.
Key Facts
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"How can life exist in total darkness at the bottom of the ocean?"
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