Why Is Growing a Bladder More Difficult Than Growing Skin

Multiple Choice

Why is growing a bladder more difficult than growing skin?

A) The bladder has more than one cell type.
B) The bladder has a more complicated architecture.
C) Growing a bladder requires stem-cell isolation from several bladder tissue types.
D) Skin cells are easier to grow because they grow in a sheet.
E) All of the above.