Final answer:
The question cannot be definitively answered with the information provided, but literary themes suggest a nuanced exploration of human-animal relationships and the ethical considerations therein.
Step-by-step explanation:
The character of Jack is not described in the information provided, hence it is not possible to definitively answer which of the actions Jack is performing: destroying, creating, ignoring, or observing the distinctions between animals and men.
However, context from various literary works suggests a thematic exploration of the lines between human and animal behavior and the ethical treatment of both.
For example, Cavendish's poem portrays men who cruelly harm animals for sport, thus blurring moral distinctions.
Jack London's work contrasts the instincts of a man and a dog in harsh environments, emphasizing differences in innate natures.
George Perkins Marsh highlights humanity's substantial impact on nature, recognizing the interconnectedness of life.
Human-animal relationships, personal and societal ethics, and the impact of humanity on nature are recurrent themes across these texts, underscoring the complex dynamics between humans and the animal kingdom.