Which of the following is not a key characteristics of thermal equilibrium? two objects must be in contact with each other
they must be at the same temperature
There must be no net thermal energy transfer
They must have different temperature

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.