Deep-Sea Life Without Sunlight

Question 1

Scientists examine the chemistry of bacteria that live near deep‑sea hydrothermal vents to decide what chemical clues to search for on icy moons. Which statement best explains why this helps when looking for life on Europa or Enceladus?

Accepted Answer

The vent bacteria can obtain energy from hydrogen sulfide, so instruments should be able to detect sulfur‑containing compounds in the moon’s ocean water.

Answer

The vent bacteria need sunlight to make food, so probes should look for signs of photosynthesis on the moon’s surface.

Answer

The vent bacteria survive only at extremely high pressures, so the main goal is to measure pressure changes on the moon’s ice shell.

Answer

The vent bacteria rely on solid rocks for food, so missions should focus on finding large mineral deposits.

Question 2

When scientists design a mission to search for life in Europa’s hidden ocean, they often study Earth’s underwater vent ecosystems. Which reason best explains why these vent habitats are useful analogues?

Accepted Answer

Both environments provide chemical energy (such as hydrogen sulfide) that microbes can use to grow without any sunlight.

Answer

Both places are warmed by surface‑level volcanoes, creating tropical‑like water temperatures.

Answer

Both locations get plenty of sunlight that lets organisms perform photosynthesis.

Answer

Both areas are filled with large fish that can be easily counted and tracked.

Question 3

A team designing a future Europa explorer wants to know what kinds of life could exist in the moon’s hidden ocean. They study Earth’s deep‑sea hydrothermal vent habitats. Which reason best explains why those vents are useful analogues for Europa’s ocean?

Accepted Answer

Vent organisms obtain energy from chemicals like hydrogen sulfide, showing life can thrive without sunlight.

Answer

Vent ecosystems are powered by sunlight that reaches the sea floor, just as sunlight reaches Europa’s ocean.

Answer

The extreme heat of vents proves that only temperature, not chemical energy, is needed for life.

Answer

The mineral shells of vent animals are identical to the shells expected on Europa, indicating the same species exist.

Try three questions

Scientists examine the chemistry of bacteria that live near deep‑sea hydrothermal vents to decide what chemical clues to search for on icy moons. Which statement best explains why this helps when looking for life on Europa or Enceladus?

When scientists design a mission to search for life in Europa’s hidden ocean, they often study Earth’s underwater vent ecosystems. Which reason best explains why these vent habitats are useful analogues?

A team designing a future Europa explorer wants to know what kinds of life could exist in the moon’s hidden ocean. They study Earth’s deep‑sea hydrothermal vent habitats. Which reason best explains why those vents are useful analogues for Europa’s ocean?

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