What, according to Singer, is the only defensible boundary of concern for the interests of others?

Question

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Singer's ethical theory is based on the principle of equal consideration of interests, which means that we should give equal weight to the interests of all sentient beings, regardless of their intelligence or any other characteristic. Sentience refers to the capacity to experience pleasure and pain, to have preferences and desires, and to be conscious. Therefore, according to Singer, the only defensible boundary of concern for the interests of others is sentience.

What, According to Singer, Is the Only Defensible Boundary of Concern