Which of the following best describes the difference between a mixture and a pure substance?
a.
a mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.
b.
a mixture has different properties throughout; a pure substance has the same properties throughout.
c.
a mixture has the same properties throughout; a pure substance has the different properties throughout.
d.
a mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom.