Question

This system gets oxygen to the cells of the body and rids the body of waste gases. Some organisms use their skin. This is also a cell-level process.

Answer 1

I think it is the Excretory System, although I might be wrong.
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Hope I helped, and good luck!
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Answer 2

Respiratory system

Step-by-step explanation:

The main function of the respiratory system is to allow the oxygen from atmosphere to enter the blood accompanied by release of carbon dioxide from blood into the air. It includes inhalation and exhalation.

Some organisms such as humans have complex respiratory systems and lungs are the main organs. Other organisms such as earthworms have moist skin with rich supply of blood vessels to serve the function of site of gaseous exchange.