Gases that react internally and with other materials are ____________ gases

Muscle relaxation is most beneficial if it is done: a. only when you have the time to enjoy yourself. b. on a regular basis

c. during periods of great stress. d. when you need physical energy.

Collection agencies are outside services that are hired to

A. refund patients after insurance pays their portion. B. bill for accounts to third-party payers. C. collect overdue accounts. D. bill patients for the deductible portions.