Principles-for-definitions:.md

@@ -14,7 +14,12 @@ where “G” (for: genus) is the immediate parent term of “S” (for: species
 Consider, as a first example, Aristotle’s own definition of “human”: 
 - human = def. an animal that is rational 
 
+Other examples:
+✅: A mammal is a vertebrate that has hair, gives live birth, and nurses its young.
 
+❌ A mammal is a vertebrate like, a cat, dog, or whale.
+
+❌ Mammals nurse their young.
 
 
 **3."Use essential features in defining terms."**