In which of the following the identity of initial substance remains unchanged? [1]
A. curdling of milk
B. formation of crystals by process of crystallisation
C. fermentation of grapes
D. digestion of food
Answer:D
In which of the following the identity of initial substance remains unchanged? [1]
A. curdling of milk B. formation of crystals by process of crystallisation C. fermentation of grapes D. digestion of food