The table shows some cellular features of three groups of organisms.
Complete the table using a tick (✓\checkmark✓) to show that the group of organisms typically possesses the feature, and a cross (×\times×) if the feature is absent.
| Group | Cell wall | Chloroplast | Nucleus | Mitochondria |
|---|---|---|---|---|
| bacteria | ×\times× | |||
| plants | ✓\checkmark✓ | |||
| animals | ✓\checkmark✓ |
Some viruses, bacteria, and fungi are pathogens.
Name another group of living organisms that contains pathogens.
Give an example of a disease in humans caused by a bacterium.
