The spiny hedgehog is a small, insect-eating animal whose body is covered by spines.
When threatened, the hedgehog rolls itself
into a ball, with all its spines facing outward.
Which of these protective strategies does the
spiny hedgehog exhibit when threatened?
A camouflage
B chemical defense
C mimicry
D physical defense

it is b for sure okay it is right

in 1972 the fluid—mosaic membrane model of membrane structure was proposed based on thermodynamic principals of organization of membrane lipids and proteins and available evidence of asymmetry and lateral mobility within the membrane matrix [s. j. singer and g. l. nicolson, science 175 (1972) 720–731].