An experiment has a high degree of when it shows convincingly that changes in behavior are a function of the independent variable and not the result of unknown variables.

a. reliability control
b. stability and rigor
c. insightful applications
d. internal validity

When something is moving, it is in motion. pressing the gas pedal in a car will put the car in motion. two important properties of motion are speed and direction. speed is how fast an object is moving. tony and tanya both run for the same amount of time, in the same direction. tanya runs much further than tony in that time. how does tony's speed compare to tanya's speed? a) their speed is equal. b) tony is slower than tanya. c) tony is faster than tanya. d) without a stopwatch, you can't say for certain.

Below is a description of a resource that you're considering using for a research paper. as you read the description, keep in mind what you've learned about historical thinking skills and use those skills in evaluating whether or not to use the source.

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?