that question about the fussion was previously asked with exactly the same words, i dont remember the year but its in the membrane structure and functions questions in the chapter based questions that TQ uploaded, and there was a part in our paper which said
"use ur knowledge of the membrane to describe these results"
the ansewr in the mark scheme is as follows:
(b) 1. The membrane is fluid;
2. (Because) {phospholipids /B} are able to move (within membrane);
3. (Therefore) proteins can move (within membrane / phospholipid bilayer);
4. Idea that there is a new arrangement of proteins;