Final answer:
When the head is turned to the left, the fluid in the inner ear moves to the left ear, stimulating the hair cells that signal the brain about movement. The echo from a predator would return to the bat's left ear first if the predator is to the left. The middle ear is connected to the nasopharynx by the Eustachian tube.
Step-by-step explanation:
When the head is turned to the left, the fluid within the inner ear canals (specifically the horizontal semicircular canal) that detect rotational movements will move. The correct answer to the question is left ear. This is because when the head turns left, the fluid in the semicircular canals also moves left due to inertia. It lags behind the motion of the head, causing stimulation of the hair cells in the left ear which signal the brain about the movement.
Regarding the GRASP CHECK, if a predator is directly to the left of a bat, the bat will know because a. The echo would return to the left ear first.
For the REVIEW QUESTION, the option not directly connected to the nasopharynx is A. middle ear. While there is a connection between the middle ear and the nasopharynx via the Eustachian tube, the middle ear itself is not part of the nasopharynx.