Energy conservation is the effort made to reduce the consumption of energy by using less of an energy service. This can be achieved either by using energy more efficiently or by reducing the amount of service used. Energy conservation is a part of the concept of Eco-sufficiency
Oxygen is always a reactant in a combustion reaction.
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Answer:

Explanation:
= Density of acetic acid = 
= Mass of acetic acid = 
= Volume
Density is given by

The volume of acetic acid is
.
Answer:
The correct option is;
c. Sound wave
Explanation:
The given options effect on mutation are given as follows;
a. Radiation
Radiation such as ultraviolet light and gamma radiation, which are electromagnetic waves, cause mutations by causing the formation of free radicals within an organism's cell resulting in the mutation characteristic effects
b. Smoking of tobacco has mutagenic effects due to the presence of several carcinogenic compounds in cigarettes
c. Sound wave is a form of mechanical wave and has no chemical effects on the chemistry of an organism and therefore does not cause mutation in cells
d. Chemical pollution can contain carcinogenic compounds that can cause mutations in the cells of organisms.