The cell membrane is described as being fluid because: A. the phosphate groups move between fatty acids.
B. the membrane lets materials pass through it.
C. the fatty acid chains are inside it.
O D. the phospholipids move from side to side.

D

Explanation:

The fluid mosaic model got its name because the plasma membrane resembles a mosaic formed by proteins embedded in a fluid of lipids. ... In the fluid mosaic model, the plasma membrane is basically composed of a lipid bilayer in which proteins are inserted.

where is the diagram?

if you insert the diagram ill be able to you

well

explanation: