Final answer:
Organisms in the deep sea survive by adapting to extreme conditions and utilizing unique energy sources.
Step-by-step explanation:
Organisms that live in the deep sea have adapted to survive in the harsh environment by utilizing various strategies. They are able to withstand extreme water pressure, very cold water, and complete darkness. Many organisms cluster around hydrothermal vents in the ocean floor, where they can obtain energy from chemicals released by the vents. For example, tube worms live around these vents and have adapted to obtain energy through chemosynthesis, a process that does not require sunlight. These organisms have unique adaptations that allow them to thrive in the deep sea environment.