A.
The respiratory system transports oxygen and other nutrients to the heart for the circulatory system.
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Answer:
High energy electron carrier used to transport electrons generated in Glycolysis and Krebs Cycle to the Electron Transport Chain.
Answer - C. The time required for the Succession to Occur
Reasoning - Behind my answer is because the time the succession evolves and grows to build life and progress to improve and expand in each certain time period.