1. Some organisms share the characteristics of both animals and plants. Example Euglena and Sponges. In Euglena, certain species contain chlorophyll and are autotrophic similar to plants. However similar to animals they are dependent on an exterior supply of vitamins B, and B12 that they cannot synthesize themselves.
2. Fungi are a class of organisms that contain features of their own. They lack chlorophyll. They are heterotrophic similar to animals. They are placed all along with green plants.
3. Most of the primitive organisms like bacteria did not fit into either group and organisms similar to slime molds are amoeboid however form fruiting bodies alike to fungi.
4. The status of virus whether they are non-living or living is a point of debate even today.
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