what sense do we object to the distinction between ‘higher (advanced) animals’ and ‘lower (primitive) animals’?

The concept of the “ladder of life” or Scalia natural fail

Some of your paper can concisely narrate the two ancestors’ tales. However, you should also explain what it means to you. In what sense do we object to the distinction between ‘higher (advanced) animals’ and ‘lower (primitive) animals’? How does the concept of the “ladder-of-life” or what sense do we object to the distinction between ‘higher (advanced) animals’ and ‘lower (primitive) animals’? fail?