A protein can not be an element, because every protein must contain at least four elements: carbon, hydrogen, oxygen, and nitrogen. A pure protein is a compound, but it may be mixed either homogeneously or heterogeneously with other molecules that are so chemically similar that they are difficult to separate.
Milk is a homogeneous mixture.
Homogeneous mixture
It is an element.
Chocolate milk is a heterogeneous mixture.
Homogeneous mixture
Heterogeneous mixture.
heterogeneous
Heterogenous
Homogeneous mixture
Milk is a homogeneous mixture.
Homogeneous mixture
homogeneous mixture
Homogeneous mixture
It is an element.
Chocolate milk is a heterogeneous mixture.
it's a compound
Aluminum is an element.