In some animal groups, the body is found divided into compartments with at least some organs/organ repeated. This rharac- teristic feature is named

Options

A. segmentation
B. metamerism
C. metagenesis
D. metamorphosis

Answer

To solve the question regarding the characteristic feature of some animal groups where the body is divided into compartments with repeated organs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a term that describes a body structure in certain animal groups where the body is divided into compartments, and some organs are repeated.

2. **Identifying Key Terms**: The key terms in the question are "divided into compartments" and "organs repeated." This suggests a form of body organization that allows for segmentation.

3. **Evaluating Options**:
- **Option 1: Segmentation**: This term generally refers to the division of the body into segments. However, it does not specify that these segments are equal or that they correspond to internal structures, so this option may not be the best fit.

- **Option 2: Metamerism**: This term refers to true segmentation where the body is divided into equal segments, and these external divisions correspond to internal divisions. This is characteristic of organisms in the phylum Annelida, such as earthworms. This option fits the description given in the question.

- **Option 3: Metagenesis**: This term refers to a life cycle that alternates between two different forms, typically involving haploid and diploid generations. This does not relate to body segmentation, so it is not the correct answer.

- **Option 4: Metamorphosis**: This term describes the process of transformation from larva to adult form, as seen in frogs. It does not relate to body segmentation or compartmentalization, making it an incorrect choice.

4. **Conclusion**: After evaluating all options, the correct answer is **metamerism**, as it accurately describes the characteristic feature of true segmentation in certain animal groups.

### Final Answer:
The characteristic feature is named **metamerism**.