it helps them when they are swimming.
Platypuses have feet with retractable webbing. They have webbed feet which help when they are swimming, but their unique design is such that the webbing membrane can be retracted when the platypus needs to dig. As the webbing retracts, the sharp claws are exposed, and the delicate webbing is not damaged by the digging action.
lipids?
cheese
it dosent
Roger Harrison has written: 'Biological membranes, their structure and function' -- subject(s): Cell membranes, Membranes, Membranes (Biology)
secret
Protection
Protection
Protection
as a component of animal cell membranes
They Expel Waste
I'm unsure about webbing of the feet, but webbing on the fingers is called syndactyly.