Question

question ①
a chamber within a bone, normally filled with air, is a ____________.
answer
sulcus
sinus
spine
canal
i dont know yet

Explanation:

In anatomy, a sinus is a chamber within a bone that is normally filled with air. A sulcus is a groove or furrow, a spine is a long - thin projection or the vertebral column, and a canal is a passageway.

Answer:

B. sinus