(a) Classify and give examples of the kinds of processes that can change (i) the number of loaves of bread in a bakery, (ii) the number of Lego pieces inside a house, and (iii) the number of coins in a safe that remains locked.

(b) For each of these three cases, what is the system? Is the transfer of the quantity of interest across the system boundary possible? Is the quantity of interest conserved?