A) A sound wave
The other 3 create mutations, are cells are hit by sound waves all the time and experience no mutations because of it
The fossil record shows a sequence from simple bacteria to more complicated organisms through time, it is very reliable because it is physical evidence and by studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth.
<span>Most of the nitrogen gas in Earth's atmosphere comes from _____.
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D. the breakdown of carbon dioxide</span>
A - the spindle from the kinetochores that attaches to the chrs and pulls them towards the poles is a microfilament.
<span>Pepsin is an enzyme that breaks down proteins into amino acids in the stomach (where the pH is 1-3). Pepsin needs to be in an acidic environment to be activated. The optimum temperature is between 30 oC and 40 oC because the average human body temperature is 37 oC. The optimum pH is the acidic one because your stomach has an acidic pH.</span>
