| Answer | Crossword Clue |
|---|---|
| ATOM | Building block of physics |
| ATOM | Physics building block |
| ATOM | Building block of nature |
| ATOM | Building block of matter |
| DNA | Building block, of sorts |
| ATOM | Building block of molecules |
| LEGO | Brand of building block |
| SIMPLEPROTEIN | Building block of life |
| AMINO | ... acid (building block of biology) |
| CINDER | Building block of a building block |
