Humans have ______ (1) ______ that animals do not have a life and maybe exploited in any way they see fit, but this ______ (2) ______ is incorrect and must be altered before it is too late. We fail to recognise that the pain we ______ (3) ______ on animals will come back to haunt us, and no matter how ______ (4) ______ the discovery we make by causing harm to animals, it will be futile. It can never ______ (5) ______ the human actions.