Question

which of the following is an example of a controlled experiment? an experiment where there is only one variable. an experiment where there are no variables. an experiment where there are many uncontrolled variables. question 4 which of hte following would be an example of an uncontrolled experiment? the effect of the jet streams on weather conditions. the effect of heat on a plants growth. the effect of salt and water being mixed at different temperatures. the effect of water on different metals in a lab.

Explanation:

A controlled experiment has only one variable that is changed or manipulated (the independent variable) while all other factors are kept constant. An experiment with no variables is not really an experiment as there is nothing to test, and an experiment with many uncontrolled variables makes it impossible to determine which variable is causing the observed effects. For the second - part, an uncontrolled experiment is one where it's difficult to control all variables. The jet - stream's effect on weather is hard to control as the jet - stream and weather systems are large - scale and complex natural phenomena. In the other options, variables can be more easily controlled in a lab setting.

Answer:

Question 3: An experiment where there is only one variable.
Question 4: The effect of the jet streams on weather conditions.