- Some microorganisms have a positive impact on human body
- If something has a positive impact on another thing, then the relationship is benificial
- Hence, some microorganisms are benificial to human body

- If something has a negative impact on another thing, then the relationship is harmful
- Disease-causing microbes have a negative impact on the body
- So, some disease-causing microbes are harmful to human body

- Some microorganisms are benificial to human body
- Some disease-causing microbes are harmful to human body
- Hence, the relationship between human and microorganisms is sometimes beneficial and sometimes harmful

Hence, the relationship between human and microorganisms is sometimes beneficial and sometimes harmful
Q: Some microorganisms cause human disease. Other microorganisms are used in making cheese, yogurt, and bread. Based on this information, the relationship between humans and microorganisms can be
Context:
- If something has a negative impact on another thing, then the relationship is harmful 
- Some microorganisms have a positive impact on human body 
- If something has a positive impact on another thing, then the relationship is benificial 
- Disease-causing microbes have a negative impact on the body