The answer is C.) Plants and animals.
<span>Whitman’s perception of America in the mid-19th
century was that it had the fullest poetical nature. This was due to the great cultural
diversity of the people who lived in America. Today, America is still a widely
multicultural continent. Even just the United States are probably the land with
the greatest mixture of different cultural backgrounds. </span>
Cave paintings are evidence of artistic ideas, language, and (possibly) religious ideas as well.