I can predict the indefinite but am never certain. I exist in models, yet I can change unexpectedly. What am I?

Category: Science · Difficulty: expert

Hint: Think about arrangements in nature.

Answer

A system

Explanation

A system can display predictable patterns while allowing for unexpected changes, crucial for scientific study.

This is a expert science riddle — one of the harder riddles here. The answer is A system.

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