Which characteristic of sound makes it possible for bats to fly in the dark without hitting any objects? A. refraction
B. reflection
C. conduction
D. amplification

__can be defined as which velocity changes

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.

What is the main reason why some developing countries fear the increase the free trade policies around the world?