Metagenesis can be seen in

Options

A. Adamsia
B. Hydra
C. Physalia
D. meandrina

Explanation

**Step-by-Step Solution:**

1. **Understanding Metagenesis**: Metagenesis refers to the alternation of generations in an organism's life cycle, where both asexual and sexual forms are present. This means that an organism can reproduce in two different ways during its life cycle.

2. **Identifying Organisms**: The question lists four organisms: Damsier, Hydra, Physalia, and Menandrina. We need to determine which of these exhibits metagenesis.

3. **Analyzing Each Organism**:
- **Damsier**: Not typically known for metagenesis.
- **Hydra**: Primarily reproduces asexually through budding and does not exhibit metagenesis.
- **Physalia**: Also known as the Portuguese man-of-war, it is a colonial organism that exhibits metagenesis. It has both polyp (asexual) and medusa (sexual) forms.
- **Menandrina**: Similar to Hydra, it does not show metagenesis.

4. **Conclusion**: Based on the analysis, the organism that exhibits metagenesis is **Physalia**.

5. **Final Answer**: Metagenesis can be seen in **Physalia**.

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