For a long time, biology textbooks taught that all life on Earth was ultimately powered by the sun. Through photosynthesis, plants and algae convert sunlight into chemical energy, forming the foundation of every food web. In this view, the dark, freezing depths of the ocean floor were assumed to be barren wastes, populated only by sparse scavengers feeding on organic debris drifting down from the sunlit surface.
However, in 1977, oceanographers exploring the Galápagos Rift made a startling discovery: deep-sea hydrothermal vents teeming with diverse biological communities, including giant tube worms, ghost fish, and blind crabs. Located miles below the ocean's surface, these ecosystems exist in perpetual darkness under crushing pressure. Instead of relying on solar energy, the primary producers in these environments are specialized bacteria that utilize a process called chemosynthesis. These organisms harness the chemical energy stored in hydrogen sulfide and other minerals spewed from the vents to produce organic matter, which in turn supports a complex web of larger organisms. This ground-breaking discovery revealed that complex life can thrive entirely independent of solar energy, fundamentally expanding our understanding of biology and the environmental conditions necessary to sustain life throughout the universe.
Which of the following statements best expresses the main idea of the passage?
- AScientific advancement always requires challenging long-held assumptions.
- BDeep-sea bacteria use chemosynthesis to convert hydrogen sulfide into organic matter.
- The discovery of deep-sea hydrothermal vent ecosystems proved that complex life can thrive without relying on solar energy.Cevap
- DBefore 1977, scientists believed that the deep ocean floor was a dark and barren wasteland.