40 ! the survivorship curves of the american robin, a type of migratory songbird, and the common green darner, a type of migratory dragonfly, are shown below. what statement is best supported by the survivorship curves? a. american robins have a high survival rate for most of their lifespan and then decline rapidly in old age. b. american robins have similar death rates throughout their lifespan, while the death rate of common green darners changes over their lifespan. c. younger american robins have higher death rates than older american robins, while younger and older common green darners have similar death rates. d. a very high proportion of common green darners reach adulthood and live to older ages.

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)