Agreenhouse is used to protect plants by keeping them warm, and retains heat in cold weather, reflects exterior heat in warm weather. Given these facts, a greenhouse is used to protect plants by doing what among the following options:
- reduced heat
 - colder and wetter
 - storing lawnmowers
 - holding plant pots
 - retaining heat
 - In the winter
 - food and shelter
 - starting fires


 

     retaining heat    