Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?

A nurse in an emergency department is assessing a client who was bitten on the left leg by a poisonous snake. The client has placed elastic bandages snuggly above and below the bite marks and is in no apparent distress. Which of the following actions should the nurse take?

A nurse is caring for a client who  is brought into the emergency department immediately following a snake bite to his forearm. The client suspects the snake to be venomous. Which of the following interventions should the nurse take?

A client who has been taking fluvoxamine (Luvox) without significant improvement asks a nurse, “I heard about something called a monoamine oxidase inhibitor (MAOI). Can’t my doctor add that to my medications?” Which is an appropriate nursing response?

Which patient should the nurse anticipate a prescription for ceftriaxone (Rocephin) IM and doxycycline (Vibramycin) orally?

When teaching a patient about ways to manage primary dysmenorrhea, the nurse will suggest that the patient:

A nurse is caring for a client who has endometriosis and will receive depot injections of leuprolide. The client asks about the effects of this medication. Which of the following information should the nurse give the client?

A nurse is providing teaching to a client who has a new prescription for tamoxifen to treat breast cancer. The nurse should include that which of the following is an adverse effect of this medication?   

A nurse is planning care for a client 1 day postoperative following a detached retinal repair. Which of the following instructions should the nurse include in the plan?

A large population of laboratory animals has been allowed to breed randomly for a number of generations. After several generations, 25% of the animals display a recessive trait (aa), the same percentage as at the beginning of the breeding program. The rest of the animals show the dominant phenotype, with heterozygotes indistinguishable from the homozygous dominants.   What is the most reasonable conclusion that can be drawn from the fact that the frequency of the recessive trait (aa) has not changed over time?