Which statement describes heterogeneous mixtures? they are made up of two or more pure substances that are not chemically bonded together. they appear uniform, like a pure substance. they have fixed ratios between their components. they are made up of two or more pure substances that can be separated only by chemical processes.

A homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. The composition of the mixture is the same throughout. There is only one phase of matter observed in a homogeneous mixture.

They are made up of two or more pure substances that are not chemically bonded together

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

nucleus

would be most reasonable answer tbh