<span>"Crista galli, </span>a superior projection on the ethmoid bone, attaches to the dura mater and secures the brain within the skull."
Crista galli is a vertical projection of the ethmoid bond where the falx cerebri attaches. The falx cerebri is a part of the dura mater that makes the division between the right and left hemispheres holding it into place.
The number of H+ ions moving down the channel.
So id say the answer is C.
Your answer would be hurricane