Two species that depend on each other for survival are evolving in a process called coevolution, in which evolutionary changes in one species result in evolutionary changes in the other species. how might coevolution present a problem to the species involved if the environment in which they lived changed?
a.)since they depend upon each other, a change that was damaging to one would also be damaging to the other.
some of the species might be forced to find different species to parasitize in order to survive the changes.
b.)the species involved would have to stop depending on each oth

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.)