Answer:The third option is the correct answer!
Explanation:
Its the the number of proteins and neutrons in the atom.
A control variable is a scientific experiment in which the experimental element is unchanged throughout the experiment
a control group is a group in an experiment that does not receive the treatment by the researchers (untouched by them) and used to see the changes between the controlled group and that of the group that received the vial
hope this helps
Those states would be Wyoming, Colorado, Utah, New Mexico, California, Arizona, And Nevada
The Upper Basin States being Wyoming Colorado Utah and New Mexico
The Lower basin states being Cali Az and Nevada
It usually get very hit during those months.