Interchangeable terms are

Options

A. Taxon and Category
B. Taxonomy and Systematics
C. Species and Subspecies
D. Genus and Species

Answer

To determine the interchangeable terms from the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**: Begin by defining the terms in each option.
- **Taxon**: A taxon is a group of one or more organisms that form a unit in a biological classification.
- **Category**: A category refers to the rank or level in the taxonomic hierarchy (e.g., kingdom, phylum, class).
- **Taxonomy**: The science of naming, describing, and classifying organisms.
- **Systematics**: The study of the diversity of organisms and their relationships.
- **Species**: A group of organisms that can interbreed and produce fertile offspring.
- **Subspecies**: A taxonomic category that ranks below species, often used for populations that are distinct in some way.
- **Genus**: A rank in the biological classification that is one level above species.

2. **Analyze Each Option**:
- **Option A (Taxon and Category)**: These are related but not interchangeable. A taxon is a group, while a category is a rank.
- **Option B (Taxonomy and Systematics)**: These terms are often used interchangeably. Taxonomy is a part of systematics, but both deal with classification.
- **Option C (Species and Subspecies)**: These terms are related but not interchangeable. A subspecies is a more specific classification within a species.
- **Option D (Genus and Species)**: These terms are also related but represent different levels of classification.

3. **Identify the Correct Answer**: From the analysis, the only pair that can be considered interchangeable is **Taxonomy and Systematics**.

4. **Conclusion**: Therefore, the correct answer is **Option B: Taxonomy and Systematics**.