Which of the following is considered to be primitive relatives of animals-

Options

A. Dinoflagellates
B. Slime mould
C. Protozoa
D. Protochordata

Answer

To determine which of the following is considered to be primitive relatives of animals, we need to analyze the options provided.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which of the given options is considered to be primitive relatives of animals. This implies we are looking for organisms that are closely related to the early forms of animal life.

2. **Analyze the Options**: The options given are:
- Diagonal Flasillated
- Smilodon
- Protozoa
- Protochordata

3. **Evaluate Each Option**:
- **Diagonal Flasillated**: This term does not correspond to a recognized group in biological classification related to primitive relatives of animals.
- **Smilodon**: This is an extinct genus of the saber-toothed cat, which is not considered primitive relative to modern animals.
- **Protozoa**: This group consists of unicellular eukaryotic organisms. Protozoa are often considered to be primitive relatives of animals because they share a common ancestor with multicellular animals and are among the simplest forms of life.
- **Protochordata**: This group includes organisms that are more complex than protozoa and are considered to be early relatives of vertebrates, but they are not as primitive as protozoa.

4. **Conclusion**: Based on the analysis, the option that is considered to be primitive relatives of animals is **Protozoa**. They are unicellular and represent some of the earliest forms of life that are related to the evolutionary lineage of animals.

### Final Answer: **Protozoa**

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