I can be small or large, but I am always crucial for structure. You can find me in bones and shells. What am I?

Category: Science · Difficulty: medium

Hint: Think about what strengthens bones.

Answer

Calcium

Explanation

Calcium is essential for building strong bones and teeth, and is found in various organisms and natural structures.

This is a medium science riddle — a moderate challenge for most people. The answer is Calcium.

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