| Answer | Crossword Clue |
|---|---|
| aerotropism | curvature in response to concentration of oxygen |
| aerotropisms | AEROTROPISM, curvature in response to concentration of oxygen |
| aerotropic | showing aerotropism, curvature in response to concentration of oxygen |
| erythropoietin | A hormone secreted by the kidneys that increases the rate of production of red blood cells in response to falling levels of oxygen in the tissues |
