I can grow in the harshest conditions, yet I am not a cactus. What am I?

Category: Knowledge · Difficulty: hard

Hint: I am a symbiotic organism often found on rocks.

Answer

Lichen

Explanation

Lichen can thrive in extreme environments and is a combination of fungi and algae.

This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is Lichen.

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