Propranolol hydrochloride (inderal) is a beta-adrenergic blocker often used as an antianginal, antiarrhythmic, and antihypertensive drug. before giving inderal to a patient, what should the nurse assess?

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.