medium · Enhanced ACT english
An oceanographer is writing about 'hydrothermal vents' on the deep ocean floor. [1] These vents spew mineral-rich water heated by magma beneath the Earth's crust. [2] In the absence of sunlight, specialized bacteria use a process called 'chemosynthesis' to convert these minerals into energy. [3] These bacteria form the base of a unique food web that includes giant tube worms and ghost crabs, proving that life can thrive in the most extreme conditions.
Which choice provides the most effective concluding sentence?
- Consequently, most deep-sea creatures are blind because there is no light at the bottom of the ocean.
- In short, the Earth's crust is made up of many different layers that are constantly moving and shifting.
- Thus, hydrothermal vents support a biological community that is entirely independent of solar energy.
- Therefore, tube worms and ghost crabs are the most interesting animals found in the deep sea today.
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