One way that the novel differs from earlier literary works is that readers are often able to relate better to the characters in novels.
A novel is a long work of narrative fiction, usually written in prose form. It is considered that all of the genre has " a continuous and comprehensive history of about two thousand years" origined in classical Greece and Rome, in medieval and early modern romance, and in the tradition of the Italian renaissance novella. Novel readers are more susceptible, to get along with the characters, relating their personal experiences with the characters in question, something that in ancient literature was not very common.
This line is foreshadowing because it implies that anything -- even people -- that becomes a burden can easily be destroyed.
Later, when Beatty himself becomes a problem, Montag burns Beatty to death. When Montag killed Beatty, he destroyed the responsibility he owed him. In this way, this line is an element of foreshadowing.
Daisy is pursued Gatsby is pursuing, Tom and Daisy are tired.
The correct version is there are many threats to dolphins' continued existence, and humans are just one.