| Answer | Crossword Clue |
|---|---|
| nucleal | of central importance; pivotal |
| POLAR | Central; pivotal |
| POLAR | Central or pivotal |
| marginal | Of secondary or minor importance; not central |
| fundamental | Forming a necessary base or core; of central importance |
| sturgeons | A very large primitive fish with bony plates on the body. It occurs in temperate seas and rivers of the northern hemisphere, esp. central Eurasia, and is of commercial importance for its caviar and flesh |
