- Microorganisms can cause contagious diseases. For example, bacteria, fungi, virus and protozoa.
- They can transmit from one place to another.
- We can take the example of the situation now. Corona is caused by a virus which is a highly contagious disease. Also, we can assume examples like tuberculosis caused by bacteria.
- Multicellular organisms might sometimes act as carriers of diseases. For example, Female Anopheles mosquito spread malaria.
- However, they act as carriers of disease.
- So, the correct option is microorganisms.
Answer:
microorganisms.
Hope you could understand.
If you have any query, feel free to ask.