What causes the Doppler effect

The reason for the Doppler effect is that when the source of the waves is moving towards the observer, each successive wave crest is emitted from a position closer to the observer than the crest of the previous wave. Therefore, each wave takes slightly less time to reach the observer than the previous wave.

Explanation: hope this helps

the apparent shortening or lengthening of the wavelength of a wave caused by the relative motion between the wave source, and an observer.

Explanation:

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69 is the correct math for the amino acids

answer; three;