Bacteria, fungi, and viruses have different structures. The table lists some structures. In each box, place a tick (✓\checkmark✓) if the structure is present or a cross (×\times×) if the structure is absent. One has been done for you.
| Structure | bacteria | fungi | viruses |
|---|---|---|---|
| cell wall | |||
| nucleus | |||
| mitochondria | ×\times× |