Suppose you wanted to compare two diffrent stain removers to learn which one was better at removing food stains from clothing. in your test, which variable would you need to control?

If you want to create an electrical current, which situation would produce a solution capable of this

Ihat will happen if i added baking soda to vinegar

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.