Mention 2 parasitic round worms.

Explanation

**Step-by-Step Solution:**

1. **Understanding Parasitic Organisms:**
- Parasitic organisms are those that live on or in a host organism and derive nutrients at the host's expense. They can cause various diseases in the host.

2. **Identifying Roundworms:**
- Roundworms belong to the phylum Nematoda. Many roundworms are parasitic and can infect humans and animals.

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