Answer: A. Plant press
Explanation:
A plant press is a contraption that is used to store samples of plants. The plants are flattened and dried so that they can be transported from one place to another primarily to enable them to be studied.
The specimens that John Muir gathered therefore must have been plants which he then stored in his plant press.
Allusion is the correct answer
I believe that distance plus sound equals the sound pressure level, but i could be wrong
