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;
brainly.com/question/61859
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natural gas or coal or nuclear power
The phase is metaphase. I can remember this because bith "meta" and "middle" start with the letter "m".
It splits in half, it was 46 chromosomes but now it 23 chromosome, one from each gamete cell, one from mum and dad, makes up 46 chromosomes.