Question

mias family added a sunroom onto their house several years ago, which reduced their electric bill. they were pleased with the difference. then they decided to add three solar panels to reduce costs further. passive solar heat depends on sunlight passing through select (glass / a greenhouse / the roof / a solar cell). active solar power comes as a result of a select (battery / glass / solar cell / technology) that converts the energy.

Explanation:

Passive solar heat works by sunlight passing through glass, which allows heat - trapping. Active solar power involves solar cells that convert sunlight into electricity.

Answer:

1. glass
2. solar cell