<u>Answer:</u> The correct answer is it is a single replacement reaction, and the anions in the two ionic compounds are different.
<u>Explanation:</u>
Single displacement reaction is defined as the reaction in which a more reactive element replaces a less reactive element from its chemical reaction. The chemical equation showing single displacement reaction follows:

A is more reactive element than element C.
Non-metals are the elements which gain electrons to attain negative charge known as anions.
For the chemical reaction:

As, non-metals are present on both the sides of the reaction, thus this means that anion in the chemical reaction are different.
<u>For Example:</u> The reaction of sodium bromide with chlorine gas, the equation follows:

Hence, the correct answer is it is a single replacement reaction, and the anions in the two ionic compounds are different.
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Answer:
The correct answer is - the place theory of hearing.
Explanation:
The place theory of the hearing is the theory that states that the hearing contends that the each component of the basiiar membrane vibrates as a in response to a sound.
In the response of the sound sensation the whole basilar membrane activates that result in the perception of the sound. The components frequencies produces vibration along the basilar membrane.
Thus, the correct answer is - the place theory of hearing.