When melanie went to a mall to buy a birthday gift for her brother, she ended up buying a new pair of designer shades for herself. she had no intention of buying them as she already owns a few pairs of shades. however, she could not resist herself as they were on sale. melanie's purchase best exemplifies an instance of

impulsive shopping

Explanation:

Impulsive buying is one that you didn't specifically leave home for, but ended up doing because you considered it a good promotion, something you longed for, or simply because you felt like it. In practice, imagine that you left home to pay some slips. On the way, you passed a shoe store and saw a nice pair on sale. It was not in your plans to buy them, but you wanted to take the opportunity. This is an unplanned purchase. That's exactly what happened to Melanie. She left home exclusively to buy a gift for her brother, but returned home with the gift and a pair of glasses, which she had not planned to buy.

those sounds of the natural world are bioacoustics, and they're more than a false-color spectrogram of data from the musiamunat conservation area.