A biologist discovers a new organism and records its features in the table below.
| Feature | Observation |
|---|---|
| Cell structure | Eukaryotic, multicellular |
| Cell wall composition | Cellulose |
| Nutrition | Autotrophic (photosynthetic) |
| Chloroplasts | Present |
| Reproduction | By spores |
| Motility | Non-motile |
Describe which kingdom (Protoctista, Fungi, Plantae, or Animalia) this organism most likely belongs to, and explain how its observed features support your conclusion.