Question

powers: the scientific method: what is science? how do i ...
the scientific method: what is science? how do i do my own experime...
multiple - choice question
shaking the containers for 60 seconds each is what type of variable?
controlled variable
independent variable
dependent variable
rewatch

Explanation:

A controlled variable is kept constant throughout an experiment. Shaking each container for 60 seconds is a condition that is held the same for all trials, ensuring consistency and allowing other factors to be tested. An independent variable is manipulated to see its effect on the dependent variable. A dependent variable changes in response to the independent variable. Since the time of shaking is held constant, it is a controlled variable.

Answer:

controlled variable