Which type of migration is shown by the cyclostomes?

Explanation

**Step-by-Step Solution:**

1. **Understand Cyclostomes**: Cyclostomes are a group of jawless fish, which include species such as lampreys and hagfish. They are classified under the class Cyclostomata.

2. **Habitat of Cyclostomes**: Cyclostomes primarily inhabit marine environments, meaning they are found in oceans and seas.

3. **Migration Purpose**: Cyclostomes migrate to freshwater environments primarily for breeding purposes. This migration is essential for their reproductive cycle.

...