| 100% | BEAGLE | 6 | Ship on which Darwin collected material for "On the Origin of Species" |
| 50% | EVOLUTION | 9 | Theory in Darwin's On the Origin of Species |
| 43% | DARWIN | 6 | Author of On The Origin of Species |
| 43% | DARWIN | 6 | Charles __ wrote On the Origin of Species |
| 43% | DARWINISM | 9 | Fundamental theory of On the Origin of Species |
| 40% | DARWIN | 6 | Charles —, author of 1859 scientific work On the Origin of Species by Means of Natural Selection |
| 40% | DARWIN | 6 | "On the Origin of Species" author |
| 40% | CHARLESDARWIN | 13 | "On the Origin of Species" author |
| 39% | DARWIN | 6 | "On the Origin of Species" author Charles |
| 38% | ORIGIN | 6 | Charles Darwin's On the __ of Species |
| 37% | CHARLESDARWIN | 13 | Medical school dropout who wrote "On the Origin of Species": 2 wds. |
| 37% | AFT | 3 | The location of the rudder on a ship, which also means "back" |
| 36% | CHARLESDARWIN | 13 | "On the Origin of Species" author who is buried at Westminster Abbey: 2 wds. |
| 36% | OVA | 3 | The origin of species? |
| 36% | UFO | 3 | Mysterious ship on the cover of Boston's "Boston," for short |
| 36% | ORIGIN | 6 | Darwin's "On the ___ of Species" |
| 35% | HMSBEAGLE | 9 | Name of the ship that Darwin famously went on |
| 35% | RIPLEYSBELIEVEITORNOT | 21 | Norbert Pearlroth spent 52 years of 60-hour weeks in the Library's Reading Room collecting material for ___ |
| 35% | DARWIN | 6 | Author of the Origin of Species |
| 33% | EBAY | 4 | Site on which a sandwich ostensibly bearing an image of the Virgin Mary was sold for twenty-eight thousand dollars |
| 32% | PLIMSOLL | 8 | __ line, marker on the sides of ships |
| 32% | ALEE | 4 | On the side of the ship protected from the wind |
| 32% | ALEE | 4 | On the side of the ship sheltered from the wind |
| 32% | CROWSNEST | 9 | Lookout platform on the masthead of a ship |
| 32% | PLIMSOLL | 8 | __ line, indicator line on the side of ships |
| 32% | SUE | 3 | Name on the cover of ''Is for'' fiction |
| 32% | ARGO | 4 | Ship in which Jason went in search of the Golden Fleece |
| 32% | AEDES | 5 | Mosquito genus whose name comes from the Greek for "unpleasant" or "odious", some species of which transmit Zika or dengue |
| 32% | WALE | 4 | Heavy plank on the side of a wooden ship |
| 32% | STEEL | 5 | "Stainless" material on the exterior of some kitchen appliances |