| Answer | Crossword Clue |
|---|---|
| ETNAS | Lab heat sources |
| LAMPS | Heat sources |
| BOILERS | Heat sources |
| STOVES | Heat sources |
| CHILIES | "Green" heat sources |
| WARMERS | Sources of comforting heat |
| FURNACES | Sources of home heat |
| LAMPS | Sources of light or heat |
| RADIANTS | Sources of heat or light |
| ectotherm | An animal that is dependent on external sources of body heat |
| ectotherms | An animal that is dependent on external sources of body heat |
