Answer:
C. digestion of food
Explanation:
in a chemical reaction the substance changes composition and the reaction is mostly irreversible.
option C: digestion of food is a chemical reaction which changes the composition of the food we eat. Enzymes and other substances react with the food and turn it into soluble substances which the body can easily use.
option A: breaking glass does not change the composition of the glass plane. Its a physical reaction
option B: freezing water changes the state of water but the composition is still the same, its a physical reaction as well.
option D: cutting a tree does not change the composition of the wood. This, too, is a physical reaction.
option E: when a liquid evaporates it changes into a gas, which is a change in the state of matter (just like water into ice), this also does not change the composition of alcohol.
