Protista is a kingdom which does not have well defined boundaries and it shows linkage with :-

Options

A. Plant
B. Animals
C. Fungi
D. All of the above

Answer

To answer the question regarding the kingdom Protista and its linkages, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Kingdom Protista**:
- The kingdom Protista is a diverse group of eukaryotic microorganisms. It includes organisms that do not fit into the other kingdoms such as plants, animals, or fungi.

2. **Historical Context**:
- The concept of the kingdom Protista was introduced by Ernst Haeckel in 1866. He classified these organisms based on their simple cellular structure and their various forms of nutrition.

3. **Characteristics of Protista**:
- Protists can be autotrophic (like plants, which perform photosynthesis) or heterotrophic (like animals, which consume organic material). This dual nature indicates that Protista can show characteristics of both plants and animals.

4. **Linkage with Other Kingdoms**:
- Protists can exhibit features similar to:
- **Plants**: Some protists, like algae, are photosynthetic and produce their own food.
- **Animals**: Other protists, like protozoans, are heterotrophic and consume other organisms.
- **Fungi**: Some protists share characteristics with fungi, such as the ability to absorb nutrients from their environment.

5. **Conclusion**:
- Given that Protista shows characteristics that link it with plants, animals, and fungi, the correct answer to the question is "all of the above."

### Final Answer:
- The kingdom Protista shows linkage with **all of the above** (plants, animals, and fungi).

---