Who proposed the $Fluid$ $Mosaic$ $Model$ for the plasma membrane?

The plasma membrane controls:

Assertion $(S)$: The plasma membrane and organelle membranes are composed of phospholipids.
Reason $(R)$: The structural component of cellular organelles is lipid.

When a cell engulfs or surrounds a particle and forms a vesicle around it,the phenomenon is known as

The plasma membrane is:

Assertion : $A$ cell membrane shows fluid behaviour.
Reason : $A$ membrane is a mosaic or composite of diverse lipids and proteins.