A greenhouse is used to protect plants from the cold.
Blizzards are heavy snows, very cold temperatures and high winds.
Greenhouses protect plants from blizzards.
What protects plants from blizzards?
Options:
(1) exoskeleton
(2) rats
(3) greenhouses
(4) horses
(5) The atmosphere
(6) peachleaf willow
(7) Blankets
(8) dogs