Which statement best explains why invertebrates often have outer skeletons but vertebrates do not? the outer skeleton provides protection, since invertebrates do not have backbones. the outer skeleton surrounds the spinal cord, since invertebrates do not have backbones. the outer skeleton invertebrates maintain homeostasis, since they lack spinal cords. the outer skeleton invertebrates maintain homeostasis, since they lack membrane-bound organelles.

Previous pagenext pagepage 3 of 10question 3 (1 point)which of the following consist of cells that do not have a nucleus? of the above

If your blood becomes too concentrated with iona, what will happen to the red blood cells

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.)