Natural selection is a type of evolution that allows organisms to adapt into the environment they're in for survival.
D.
If the vibrations have a low frequency, the sound is heard as a __low-pitched sound_____. If the vibrations have a high frequency, then the sound is heard as a __high-pitched sound_____.
Explanation:
High pitched sound is of higher frequency because they make the air molecules vibrate much faster than low-pitched sound. Due to their high frequency, their wavelength is shorter (Remember wavelength and frequency are inversely proportional). Vice versa is true to the low-pitched sound. They vibrate air molecules slower than high-pitched sound. Their wavelength is longer and frequency smaller.
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For mor on pitch of sound check out;
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Breathing, Digesting, and drinking.
Answer : A prophange is the result when viral DNA has inserted itself into the bacterial DNA.
