Ethanol is considered a renewable resource and a self-maintaining source of energy. It is used as a biofuel and produced through chemical treatments of crops such as corn and sugar cane. Which processes enables ethanol to be a self-maintaining renewable resource

Ethanol, derived from plant material, is a renewable energy source because the production and combustion of ethanol completes a cycle. The amounts of carbon dioxide and water that plants use are returned back to the atmosphere when ethanol, made from plant starch or cellulose, is combusted.

Explanation:

the ems is the abbreviation for the emergency medical services. it is a service provided by a group of medical professionals specialised doctors and other healthcare staff.

any one can call 911 in case of any medical emergency and a group of health care professional will come and give the treatment required. every day the ems staff receive many phone call, which are related to different types of medical emergencies, out of which 25-28% are exclusively related to the respiratory issues.

so, the correct answer is 25-28%.