The formation of bone from a cartilaginous model is termed

Evolution

Explanation:

Evolution is the gradual directional change especially one leading to a more advanced or complex form

From a cartilaginous model, bone evolved into existence because it is STRONGER, AND MORE RESISTANT to diseases and external conditions than the preceding Cartilage.

Note that the aim of Evolution is to expressed traits with highest survival rate; so, there is BONE.

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%.