Economical. This has the most positive connotation out of all of the options listed here.
"Inferior" implies that the quality is lesser than other potential materials that could have been used.
"Second-rate" and "Sub-standard" also imply the same message.
"Economical" has the most positive connotation, because it implies that the materials are monetarily cheap but does not really imply anything about the QUALITY of the cheap material.
It says 'evidence' so I'm going to say statistic...
Answer:
the quality of being slippery or difficult to trap.
Explanation:
The unshelled fish is lively and elusive: the unshelled fish seems to exist in a permanent mode of hide and seek. As though, its sole purpose is to prevent potential predators from coming close.
Thoreau mostly uses imagery to illustrate time in the excerpt. The second sentence is saying that he is in the midst of time/living, and he can "detect how shallow it is," meaning that he is aware that life is short and that the end is inevitable. Thoreau also describes time as being fleeting, but ever-present.
I hope this helps!