B. Geologists determined the depths of layers when the waves were reflected back to the source.
The substances water, oxygen, and adenosine triphosphate (ATP) are produced by cellular respiration.
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Answer:
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Answer: The body is a system filled with smaller systems. Each used to help out the other and benefit the body as a whole. For example, the respiratory system takes in oxygen, the heart then takes the oxygen in the blood and pumps it throughout the entire body. Then veins carry that blood to muscles and organs. Each unique system has a job to do, when one malfunctions the whole system can fail.
Explanation: Hope this helps :)
