Across
- 3. this can done to buildings to reduce many of the casual groups
- 7. example of an internal parasite
- 8. keeping these clean in sheep can reduce external parasites
- 9. controlled by antibiotics
Down
- 1. some types can be controlled by vaccination
- 2. smallest type of causal organism
- 4. virus invade these and multiply
- 5. (7/6)bacteria can live and multiply in this
- 6. external parasites can produce these