Milk is a heterogeneous mixture that contains different types of particles in different phases. due to the sizes of the particles in milk and the way they are dispersed, the particles do not easily settle out. they also cannot easily be filtered out. therefore, milk is best described as a

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.