In an experiment, 90 newborn flies are divided evenly into three separate
groups and placed in boxes inside an incubator that is maintained at a
constant temperature of 30°c. on a daily basis, the first group is given water
containing 1 mg/ml of sugar, the second is given water containing 2 mg/ml
of sugar, and the third is given water containing 3 mg/ml of sugar. after four
weeks, the average length of the flies in each group is determined.
which factor is the independent variable in this experiment?
a. concentration of sugar in the water
b. average length of flue in a group
c. temp of the incubator
d. number of flies in a group

In 1992, hurricane andrew left a wake of destruction through florida. one victim of the storm was a reptile-breeding facility. over 900 burmese pythons were set free, and today thousands of pythons live in florida. these pythons are an invasive species, or a harmful species not native to the region. 1. what impacts do you think the burmese pythons might have on local ecosystems

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.)

Which of the following leukocyte is not correctly matched with its function? lymphocytes: immune response against viral infections eosinophil: bacterial macrophage monocytes: macrophage basophils: inflammation eosinophil: bacterial macrophage