Answer:
2. Humans are frail
3. The dog's instinct guides it, while the man's intellect fails him
Step-by-step explanation:
- When the passage mentions a reflection on the conjecture of immortality and man's place in the universe, it was a reference to the frailty of man who is here today and gone tomorrow. The writer was saying that the cold did not allow the man to think about the theory of immortality which could be true or false. Overall the reflection is about the frailty of man and his likelihood of overcoming it by becoming immortal.
- The narrator was saying that although the dog knew nothing about temperature measurements, its instincts guided it properly to the conclusion there was something unusual about the cold, which the man's intellect did not tell him.