What is the difference between the rhetorical devices juxtaposition and antithesis?

In washwoman who is the narrator telling the story

Which point(s) of view do whitman's and coleridge's speaker use ?

Which statement contains an opinion? the ants serve to protect the acacia from other plants and herbivores. the acacia depends on pollinators for the exchange of genetic material. the acacia has no chemical defenses to discourage herbivores. the ants provide the acacia with the best protection from other plants and herbivores.