Which of the following mixture types cannot be filtered to remove solutes?
a. colloids only
b. suspensions only
c. suspensions and colloids
d. suspensions and solutions

why do colloids exhibit brownian motion? *
a. coagulation of particles of the dispersed phase
b. erratic flashes of light
c. molecules of the dispersion medium colliding with dispered phase particles
d. there is no brownian motion in colloids.