After spawning , adult lampreys

Options

A. migrate back to fresh water
B. migrate back to ocean
C. die in fresh water
D. die in ocean

Answer

### Step-by-Step Solution:

1. **Understanding Lampreys**: Lampreys belong to the class Cyclostomata and are scientifically referred to as Petromyzons. They are known for their unique life cycle and habitat preferences.

2. **Life Cycle Stages**: Adult lampreys spend their early life in freshwater. This stage is crucial for their development before they transition to other environments.

3. **Habitat Transition**: After their early life in freshwater, adult lampreys move to saltwater or large freshwater lakes during their middle life. This transition is essential for their growth and maturation.

4. **Breeding Season**: During the breeding season, adult lampreys return to freshwater to spawn. This is a critical part of their life cycle, as it ensures the continuation of their species.

5. **Post-Spawning Behavior**: After spawning, adult lampreys do not survive for long. They die shortly after spawning in the freshwater environment where they laid their eggs.

6. **Conclusion**: Therefore, the answer to the question "After spawning, adult lampreys..." is that they die in freshwater shortly after spawning.

### Final Answer:
After spawning, adult lampreys die in freshwater.

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