Agreenhouse is used to protect plants from the cold, and greenhouses are made with glass , fiberglass , polyethylene, or vinyl coverings. Given these facts, what protects plants from the cold among the following options:
- Something made of fruit or vegetables
 - series of enzyme-mediated reactions
 - Something made of glass, fiberglass, polyethylene, or vinyl
 - Something whose growth is discouraged by heavy wet soils
 - keeping food fresh for long periods of time
 - Something made of brick
 - Something made of metal
 - gas layer that surrounds earth


 

   Something made of glass, fiberglass, polyethylene, or vinyl      