Fact 1: Alight bulb is used for seeing in the dark.

Fact 2: Incandescent light bulbs use a tungsten filament sealed inside a glass bulb.

Given the two facts above, answer the question "Tungsten filaments sealed in a glass bulb are used for what in the dark?" with the following options: 
- photons
 - energy
 - seeing
 - stay warm
 - sleeping
 - talking
 - communicating
 - heat


 

   seeing      