A ___ is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change when scientists ___ for the first one:

A. fact

B. hypothesis

C. theory

for the second one:

A. conduct experiments

B. generate hypothesis

C. hold different opinions

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

catya your not at all which answer i've seen you do this on another question!