THIERRY BERROD / SCIENCE PHOTO LIBRARY THIERRY BERROD / SCIENCE PHOTO LIBRARY
Cave microbial mat, montage footage. Footage of the wall of the Cueva de Villa Luz (Cave of the Lighted House) in southern Mexico, transitioning via zoom footage to light microscopy footage of the microbial mat that covers the walls of the cave. This shows the microscopic organisms that live in the biofilm that covers the walls. The waters in the cave are rich in the poisonous gas hydrogen sulphide. The hydrogen sulphide also forms the basis of a chemical food chain and ecosystem, rather than one based on sunlight.
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