Plants can seem to follow the light during the day, or at least grow towards them. Since they have no eyes how does this actually occur?

Which material burns faster? metal aluminum

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?