1. Which makes photovoltaic systems especially useful? 1They require no equipment.
3They generate electricity.
4They convert fossil fuels into energy.
5They need perpetual sunlight.

I think its 3 i might be wrong tho

The answer would be c

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.