Lady Macbeth is an example of pure ambition in the play. She, and not her husband, is the mastermind behind the plot to kill the king. Lady Macbeth comes up with the plan to murder the king once she discovers that he will be a guest in her home.
"To take care of all it's needs". If a large creature's needs can not be met, it will die. Therefore, this would be the answer to your question.
