In a , the bars that represent the categories of a variable are spaced so that one bar is not directly next to another; whereas in a , the bars actually touch one another.

The correct answer would be "bar graph; histogram".

Explanation:

The bar graph has become a photographic arrangement of information which always practices that relate bars to consider various give information. Alternatively, this is indeed a diagrammatic comparative analysis of univariate data. This same histogram demonstrates the variation including its frequency of repeated measures, introduces numerical information.

Answer made of magnesium alloy;