When we move from species to kingdom in taxonomic hierarchy. The common characters from one taxon to another taxon :

Options

A. Can increase
B. Can decrease
C. Always decrease
D. Can decrease or increase

Answer

To answer the question regarding the common characters from one taxon to another taxon when moving from species to kingdom in taxonomic hierarchy, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Taxonomic Hierarchy**:
- Taxonomic hierarchy is a system used to classify and organize living organisms into different ranks or categories. The major ranks include species, genus, family, order, class, phylum, and kingdom.

2. **Identifying the Movement in Hierarchy**:
- When we move from a specific taxon like species to a broader taxon like kingdom, we are moving from a more specific classification to a more general one.

3. **Analyzing Common Characters**:
- As we move up the hierarchy from species to kingdom, the number of specific characteristics that define the organisms tends to decrease. This is because species are defined by very specific traits, while kingdoms encompass a wide variety of organisms that share only the most general characteristics.

4. **Example for Clarification**:
- For instance, consider a mango tree (Mangifera indica) which is classified under the plant kingdom. The mango tree has specific characteristics (like being a flowering plant, having a specific type of fruit, etc.). In contrast, the plant kingdom also includes a wide range of organisms, including unicellular plants like Chlamydomonas, which have very different characteristics. The specific traits that define the mango tree are not applicable to all plants.

5. **Conclusion**:
- Therefore, as we move from species to kingdom, the common characters from one taxon to another taxon always decrease.

### Final Answer:
- The correct answer is: **Always decrease**.

---