Answer
b and e.
b. have parietal and visceral layers.
e. secrete a lubricating fluid.
Work Step by Step
Serous membranes or serosa line body cavities that are closed.
These membranes occur in two layers: parietal and visceral.
The layers are separated by serous fluid that is secreted by the membrane.
Serous fluid provides lubrication and avoids friction amongst mobile organs.
