I thrive in the darkest depths, yet I am crucial for life on the surface. What am I?

Category: Science · Difficulty: hard

Hint: Think about how life can exist without sunlight.

Answer

Deep-sea microbes

Explanation

Chemosynthesis is a process by which organisms, such as those in hydrothermal vents, create energy from chemicals, not sunlight.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Deep-sea microbes.

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