Heterogeneous mixture is a mixture that is made up of different substance that remains physically separated which means the cell organelles (Red blood cells, white blood cells, platelets etc.)present in blood does not mix completely and hence get precipitated after kept still for a while.
There are three ways to identify a Heterogeneous mixture.
It has chunks of stuff that you are able to see with your eyes.
It appears cloudy(blur).
After a while, the substance will separate into layers at settle at the bottom(gets precipitated).
