Answer:
There are some organisms which are not classified in plants and animals kingdom because there are some animals which has the characteristics of both plants and animals. For example, a specific organism make their own food like plants and also move from one place to another like animals.
Characteristics of kingdom protists :
1) They are made of one cell.
2) They are eukaryotic cell.
3) Some are autotrophic and some are heterotrophic organisms.