Regarding fundamental properties of charge, complete the following sentences. A. For every positive charge there is a
B. Opposite charges .
C. Like charges .

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.

Compare and contrast refraction of light and sound will give brainliest

Can someone me with 3 and 4 plz. this is for masteries test.