Question

this fluid - filled, inner ear structure pertains to dynamic equilibrium:
semicircular canals
cochlea
scala media
spiral organ

Explanation:

To solve this, we analyze each option:

• Semicircular canals: These are fluid - filled inner ear structures responsible for dynamic equilibrium (balance during movement).
• Cochlea: Involved in hearing, not dynamic equilibrium.
• Scala media: Part of the cochlea, related to hearing.
• Spiral organ (organ of Corti): Also related to hearing.

So the correct option is the one related to dynamic equilibrium.

Answer:

A. semicircular canals