Answer:
A solution is always transparent, with no scattering particles from solute.
A colloid is some substances remain despered and do settle in the bottom.
A suspension is a mixture in which the solute particles do not get dissolve but get suspended.
colloids and suspension are both heterogeneos mixture.
colloids and solutions both light can passes (in solutions without scattering, and colloids scatter light but light can pass)
suspension and solution both can be separated based on their physical properties.
THEY ARE ALL MIXTURE