Carbon is usually the result of burning fuels, cars, busses, taxi's
Answer:
[D] Pitch
Explanation:
The measure of how high or low a sound is called the pitch.
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An experiment is a process where the a scientist tests and draws their evidence and data from. Hence, this process is where the hypothesis be supported or negated.
Variables are traits, factors, or characteristics that either manipulated or measured being the subject to become the data.
The independent variable is B.
<span>the presence of the new antibiotic</span>