| Answer | Crossword Clue |
|---|---|
| VALVE | One of four in the human heart |
| CHEEK | One of four on the human body? |
| NEURON | One of about 100 billion in the human brain |
| FOR | "When in the Course of human Events, it becomes necessary ... one People ..." |
| AIR | One of the four elements, in alchemy |
| ADENINE | One of the four bases in DNA |
| STANZA | One of four in "America, the Beautiful" |
| TIMEZONE | One of twenty-four in the world |
| ETE | One of the four seasons, in France |
| PESTILENCE | In some versions, one of the Four Horsemen. |
| SWITZERLAND | One of the world's four countries not in the United Nations |
| ANAPEST | One of four in "'Twas the night before Christmas, when all through the house" |
