Answer:
The Mississippi River allowed quick transportation.
This question is missing the options. I've found the complete question online. It is the following:
As part of a study in auditory perception, a group of students was made to listen to a low-volume music track. When they first put on their headphones, they almost couldn’t hear anything. But as they became more attentive, the sound gradually became clearer. This is an example of _________.
a. retinal disparity
b. pitch increase
c. sensitization
d. subliminal stimulation
Answer:
This is an example of C. sensitization.
Explanation:
According to the given scenario, the sound was not altered. Its volume, its pitch - everything remained the same. There was, however, an alteration in people's perception of the sound, and that is due to a process known as sensitization. Sensitization happens when a certain stimulus becomes more effective because of repetition or continuation. That is, because people kept on listening to the sound, even though it was low, they were able to hear it after a while.
The profession that a person can rely on the information about parallel and perpendicular lines are the civil engineers. They will know if the structure of the building having perpendicular beams means that it may or may not be stable depending on the material used.
