Self-insurance refers to: the practice of setting aside funds to pay for medical care expenses instead of paying premiums to an insurance company. approximately, of all employees who participate in group insurance plans work for firms that self-insure.

Approximately, "more than 50%"  of all employees who participate in group insurance plans work for firms that self-insure.

Explanation:

Self-insurance refers to the practice of setting aside funds to pay for medical care expenses instead of paying premiums to an insurance company. Approximately, more than 50% of all employees who participate in group insurance plans work for firms that self-insure. Self-insurance, it is a state or a condition where a person never takes part in the third party insurance. Basically it means besides paying the money to any insurance company for medical, dental and or vision claims the amount is paid to the self, keeping a third party who can process the claims on the behalf of that person.

the answer is "a.) well–developed vascular system."

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