| 100% | BRISTLECONEPINE | 15 | Tree that's among the oldest known life forms on earth (4,800+ years) |
| 37% | HUMANS | 6 | Life-forms that originated on the planet Earth |
| 32% | NOH | 3 | The oldest known theatrical art that’s still performed today |
| 32% | CEDAR | 5 | Tree that's on the flag of Lebanon |
| 32% | BESTOFMYLOVE | 12 | Song by the Emotions that was #3 on Billboard's year-end Hot 100 for 1977: 4 wds. |
| 29% | TECTONIC | 8 | Giant plates that form the Earth's crust |
| 29% | TECTONIC | 8 | Moving plates that form the Earth's crust |
| 28% | THEFOGOFWAR | 11 | Documentary film based on Robert S. McNamara that won the Oscar for Best Documentary Feature in 2003: 4 wds. |
| 28% | EVERGREEN | 9 | Tree that keeps its leaves throughout the year |
| 28% | OREO | 4 | Cookie that's the subject of the Wiz Khalifa song "Playful 4 Life" |
| 28% | ANT | 3 | Insect that the film "A Bug's Life" is based on |
| 28% | MOUNTETNA | 9 | Probably the oldest active volcano on Earth |
| 27% | SUN | 3 | Solar System's star that is over 4.5 billion years old |
| 27% | ONENINTH | 8 | Approximate proportion of the world's population that lives on an island |
| 27% | THEWIZARDOFOZ | 13 | 1939 fantasy movie that's based on the same books as 18-Across: 4 wds. |
| 27% | ANTZ | 4 | Movie that improbably came out the same year as "A Bug's Life" |
| 27% | ACORNS | 6 | The nuts that grow on oak trees |
| 26% | AULD | 4 | "___ Lang Syne," song that's sung on New Year's Eve to bid farewell to the previous year |
| 26% | AXIS | 4 | Imaginary line that the Earth rotates on |
| 26% | CACAO | 5 | Tree that's the source of chocolate |
| 26% | NUTMEG | 6 | Tree that's the source of mace |
| 26% | YEW | 3 | Tree that's the source of Taxol |
| 26% | STONEHENGE | 10 | World Heritage Site that's more than 4,000 years old |
| 26% | GOLDEN | 6 | Pear that grew on the little nut tree |
| 26% | STRAY | 5 | Cat or dog that lives on the streets |
| 26% | LETSGETITON | 11 | Marvin Gaye hit that was #4 on Billboard's year-end Hot 100 for 1973: 4 wds. |
| 26% | KIMBRA | 6 | Featured artist on Gotye's "Somebody That I Used to Know," the #8 song of the 2010s |
| 26% | TARTAR | 6 | Deposit that forms on the teeth |
| 25% | CITI | 4 | One of the oldest banks in the world, formed in the year 1812 |
| 25% | ART | 3 | Surprising discovery at the Lascaux cave that's 17,000 years old |