Likeness: both mixture and pure substances have weight and they occupy space. They are also made up of atoms, which are components which can not be divided further. Differences: Pure elements have fixed proportions and compositions while mixture does not. Mixtures can be mixed in any proportion and can composed of many substances.
These are all true except <span>"D. Natural selection usually causes a species to change suddenly," which is false. Natural selection and the subsequent changes to a species takes many thousands of years to have observable results. </span>
