Answer:
Macbeth himself is not a totally evil man. There is much about him that is good and he experiences an on-going struggle with his conscience. Good is shown in many symbols throughout the play. Heroism - Duncan and his men represent right and order.
Explanation:
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Humans need to eat and drink in order to survive, therefore it against natural law to deprive oneself of food and water, as natural law says that species must survive.