The answer is mitochondria because mitochondria is involved in cellular respiration.
An exoskeleton is the outer skeleton of an animal to protect them. An exoskelton is also called a shell.
Http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072434/
There is a website with some info. Hope it helps! :)
<span>Patients are listed in a patient register under a unique number, which makes up the </span>master patient index.
Patient index number is making the billing and insurance system work more easily. It can also help to differentiate patient with a similar name.