- Transpiration is a stage in the water cycle process
- Transpiration is when water vapor moves from plants into the atmosphere
- Therefore, transpiration of plants is a stage in the water cycle process by moving water vapor from plants to atmosphere

So, transpiration of plants is a stage in the water cycle process by moving water vapor from plants to atmosphere
[Question]Why should plants be included in investigations about the water cycle?
[Context]- Transpiration is a stage in the water cycle process 
- Transpiration is when water vapor moves from plants into the atmosphere