ANSWER
Wbottom = Fadhesion
Step-by-step explanation
The system is formed by the two blocks together. The tension force is holding these two blocks, so the tension force is equal to the total weight of the system - in other words, to the sum of the weights of the blocks.
The adhesion force is the force that is keeping the two blocks stuck together, so it is not an external force, but an internal force of the system. Since the blocks are hanging, the adhesion force must be such that the bottom block doesn't fall off. Hence, the adhesion force is equal to the weight of the bottom block.