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Centuries ago, living things were classified as either plants or animals. Today, the classification of living things helps us gain a better understanding of the world we live in, our relation to living things, and understanding Biology better overall.
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IAMTHEGOAT
Hydrochloric acid is found in the stomach
Given that,
The speed of a wave, v = 200 m/s
Wavelength, 
We need to find the frequency of this wave. The relation between wavelength, frequency and the speed is given by :

So, the frequency of this wave is 100 Hz.
<span>d. all of the above<<<<<<<<<</span>
Heterozygous (brainly needs me to put more characters in)