Question

Sound waves entering the ear canal lead to vibrations in the _________, which then creates a fluid wave first in the ___________ duct.

Answer 1

The answers to your question are; oval window and vestibular.

Sound waves entering the ear canal lead to vibrations in the
`\boxed {\bf oval~window}` , which then creates a fluid wave first in the
`\boxed {\bf vestibular}` duct.

I hope this helped you!