Why does water boil at a lower temperature at higher altitudes

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

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?