The following graph shows the gas speed distributions for four different gases, all at the same temperature. Select the curve that represents the heaviest gas and explain your rationale for the choice. 
Definitions:
Background Color
An attribute or property that sets the color behind an element or screen in web pages or graphical user interfaces.
Applet
A small application typically programmed in Java, that runs within a web browser or viewer.
Radio Buttons
GUI elements that allow users to select one option from a set, typically rendered as a small circle that can be filled or cleared to indicate selection.
Check Boxes
GUI components that allow the user to make a binary choice; typically used to select or deselect a single option.
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