<span>The answer is True. Doppler Effect is defined as “the change( increase of decrease) found in wave, sounds or light as the soure and observer slowly walks away. Examples of this would be ripples formed when ducks are swimming in the lake or the sound of the sirens, going higher as they moved to another destination</span>
The answer is D. Because the bird has to be noticed and the brighter the feathers the more likely the chance to be noticed.
Scales of a fish, I kind of read or heard people getting drafts of fish skin which might be the same.
Bonds between the strands are relatively weak hydrogen bonds, whereas bonds within the strands are relatively strong covalent bonds.
