| Answer | Crossword Clue |
|---|---|
| heliotactic | relating to heliotaxis, the response of an organism to the sun's rays |
| heliotaxes | HELIOTAXIS, the response of an organism to the sun's rays |
| heliotaxis | the response of an organism to the sun's rays |
| geotactic | relating to geotaxis, the response of an organism to gravity also GEOTACTICAL |
| geotactical | relating to geotaxis, the response of an organism to gravity also GEOTACTIC |
| geotactically | GEOTACTICAL, relating to geotaxis, the response of an organism to gravity also GEOTACTIC |
| rheotactic | relating to rheotaxis, the movement of an organism in response to a current of water |
