Across
- 4. the most ductile metal
- 5. control centre of a cell
- 7. smallest cell in existence
- 8. hardest substance
- 9. ability of an organism to resist infection
Down
- 1. process of conversion of dead plant material into coal
- 2. give colour to the plants
- 3. causes citrus canker
- 6. a homogeneous mixture of two or more metals
- 7. coal made up of 30 percent carbon