Question

Is milk a mixture, solution, or both?

Answer 1

Milk is a mixture and a solution. Since it consists of components that are physically combined, its a mixture. Its also a solution because its uniform. 

Answer 2

It is both. It is a mixture because it has two or more things mixed in it. It is a solution, because all of the components and things mixed in the milk are uniform and milk isn't chunky or discolored because of that.
Hope this helps.