Most people ended up dying at the age of 70
Answer:
Methods
.
Explanation:
A method is a process or procedure by which a thing is got or a solution is found. It involves a sequential procedure that has to be adhered to, to get to the desired result.
The given excerpt from a science text lists the steps that must be done to do the <em>"experiment"</em>. These steps include filling <em>"two identical glasses with water"</em> which has to be further added with salt and food coloring and then stirred. So, in short, we can say the passage shows the method by which the experiment can be done.
Thus, the correct answer is the second option.
