I think it’s D............
<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>
I honestly don't remember much about this and I'm sure someone else will answer more thoroughly for you but I believe it is the "<span>messenger". It carries instructions from DNA to conrol the synthesis of proteins</span>
The answer is the hydrogen bond. All those neat properties of water occurs due to the hydrogen bond
