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Sentence 1 is the odd sentence.
Sentence 4 introduces the historical significance of Peter Singer’s Animal Liberation, which set the stage for the discussion of animal rights in contemporary philosophy.
Sentence 2 expands on Singer’s philosophy, explaining his utilitarian view and how it contrasts with other indirect moral views on animal rights.
Sentence 3 then explains the core of Singer’s argument, that animals, like humans, have significant interests and deserve moral consideration.
Sentence 5 concludes Singer's argument by stating that humans should treat animal interests equally to human interests, leading to moral duties towards animals.
Sentence 1 is the odd one out because it does not focus on Peter Singer's views on animal rights and the moral obligations humans have towards animals, which is the main theme of the paragraph.
The correct sequence is 4-2-3-5.