Explanation by: Kirti
Ulva is not a disease; it is a green algae commonly known as sea lettuce. It is a type of marine algae found in oceans and freshwater.
- AIDS is caused by the HIV virus.
- HIV (Human Immunodeficiency Virus) leads to AIDS.
- Flu (Influenza) is caused by the Influenza virus.
Since Ulva is not a disease, it is the correct answer.
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