Which type of mixture looks like it is one substance

It is the homogeneous mixture. A homogeneous mixture is a strong, fluid or vaporous blend that has similar extents of its parts all through a given example. The homogeneous blend can have a variable piece. 
It is a mixture of at least two unadulterated substances in which the first substances hold their concoction properties. In a few blends, the underlying substances can't be recognized after they have been blended.