In binomial nomenclature, the first and second components represent:

Options

A. Genus and species
B. Genus and class
C. Species and genus
D. Kingdom and class

Answer

### Step-by-Step Solution:

1. **Understanding Binomial Nomenclature**:
- Binomial nomenclature is a formal system of naming species. It was developed by the scientist Carl Linnaeus.

2. **Components of Binomial Nomenclature**:
- The name consists of two parts: the first part and the second part.

3. **First Component**:
- The first component of the name represents the **genus**. This is a group of species that are closely related.

4. **Second Component**:
- The second component represents the **species**. This is a specific epithet that identifies the particular species within the genus.

5. **Evaluating the Options**:
- Option 1: Genus and species - This is correct.
- Option 2: Genus and class - This is incorrect as the second term should be species, not class.
- Option 3: Species and genus - This is incorrect as the first term should be genus, not species.
- Option 4: Kingdom and class - This is incorrect as neither term is relevant in binomial nomenclature.

6. **Conclusion**:
- The correct answer is **Option 1: Genus and species**.