The endocrine system is one the system in the human body that regulates all the hormones which aids in the normal functioning of the other systems. Therefore, the major functions of the endocrine system include metabolism, and puberty body. Hope this answers your question.
Since no human is breathing anymore, the Carbon di-oxide cycle will be affected. In fact, many natural cycles will become free from human disturbance.
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It results in an unhealthy residence area.
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I would explain but the right answer is the first option. Hope this helps!