Fact 1: Transpiration is when water vapor moves from plants into the atmosphere.

Fact 2: Transpiration occurs as long as stomates are open.

Given the two facts above, answer the question "what must happen for water vapor to move from plants into the atmosphere?" with the following options: 
- plant must be dead
 - Condensation
 - stomates must be open
 - evaporation
 - cells must be closed
 - must be cloudy
 - Warm air moving into cold air
 - vaporization


 

   stomates must be open      