Fill in the following blank with suitable words:
Untreated human excreta may cause …………pollution and …….pollution.

Answer

To fill in the blanks in the statement "Untreated human excreta may cause …………pollution and …….pollution," we need to identify the types of pollution that can result from untreated human waste.

1. **Identify the first type of pollution**:
- Untreated human excreta is often disposed of improperly, which can lead to contamination of water bodies. This results in the pollution of water sources.
- Therefore, the first blank can be filled with "water".

2. **Identify the second type of pollution**:
- Additionally, when untreated human excreta seeps into the ground or is improperly disposed of, it can contaminate the soil, leading to soil pollution.
- Hence, the second blank can be filled with "soil".

Putting it all together, the completed statement is:
"Untreated human excreta may cause **water** pollution and **soil** pollution."