Sentence:  During the decade that followed , the common man , as that piece put it , grew uncomfortable as the Voice of God and fled from behind Saint Woodrow ( Wilson ) only to learn from Science , to his shocked relief that after all there was no God he had to speak for and that he was just an <WSD>animal</WSD> anyhow - that there was a chemical formula for him , and that too much could n't be expected of him . 
Meaning of the word marked with <WSD> tags:  a living organism characterized by voluntary movement