Our main source of energy is the sun. True.
Answer : Colloid
Explanation : Any colloid which consist of a solid evenly dispersed in a gas phase can be called as smoke. So, if smoke has to be given a matter of substance then it is can be categorized as a Colloid present in gaseous phase. Smoke is a solid which contains minute particles of dust which is homogeneously dispersed in the air.
Answer:
B. People live longer than they used to
Explanation:
None of the other answers are correct.
CH and O is the reactants while CO and H2O is the products
