A cloth is tightly wrapped round the arm at point Z and the veins stand out Clearty. One finger presses firmly on the vein at W.

When another finger strokes the vein, as shown In the diagram, the vein lies flat between points
Wand Y.

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them