It is january and haley, sarah and becky are tired of having cold feet while waiting for the school bus to come in the morning. they decide to design an experiment to test the effectiveness of wool, cotton and nylon as insulators. they fill identical bottles with 200 ml of water at 100 c and place inside each sock. they take the temperature of the water after 20 minutes.

what is the independent variable (manipulated variable) in the following experiment?
question 2 options:

identical bottles with 200 ml of water.

the different types of sock materials as insulators.

the temperature after 20 minutes.

having cold feet.

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.)