There Are Tube Worms and Clams That Live at the Bottom

question 17

Multiple Choice

There are tube worms and clams that live at the bottom of the ocean near thermal vents. They derive their energy ultimately from

• A) the sun, by way of burning fossil fuels like we do with coal and oil.
• B) the sun, but they are deep in the dark ocean and live off dead detritus that sinks to them.
• C) bacteria that break apart hydrogen sulfide molecules and are therefore not dependent ultimately on sunlight.
• D) sources not yet known.
• E) photosynthesis.

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