Question

the primary auditory cortex is responsible for: determining a sounds frequency by examining the activities of neurons. sending the vibrations formed by sound waves to the oval window. ensuring that the bones of the middle ear remain fused together collecting sound waves that approach the ear and sending them down the ear canal.

Explanation:

The primary auditory cortex processes auditory - related information. It determines a sound's frequency by analyzing neural activities. Sending vibrations to the oval window is a function of the middle - ear structures. Ensuring middle - ear bone fusion is not its role. Collecting sound waves is the job of outer - ear structures.

Answer:

determining a sound's frequency by examining the activities of neurons.