What is eye to eye and tooth to tooth?

What is the name of the DNA sequence that is located newr the promoter of the lactose operon and regulates the expression of the operon in E.Coli? Should compressions on the sternum should be administered on a person whose heart is beating? I have grape sized hard lump on my head near hair line and its not painful. What could it be and I am thinking of getting an op? Can isopropol be absorbed through the skin when using it for French polishing making you over the limit for drink driving? What fitness exercises help breasts grow or get bigger? Why can not conceive after having 2 children? Can one's nose be dislocated? Why does my back hurts so much? What practice should be used to prevent seafood toxins from causing a food-borne illness? What is meant by the ideal pupil? How is speed defined? What sphincter controls the flow between the duodenum of the small intestine? What ingredient in dandruff shampoo kills lice? What if the ultrasound showed that the baby has two veins? Does the frontal bone protect the anterior portion of the brain? Can MRSA be caused from mold or mildew? How do the tissues work together in the heart? What muscle works in a pair with the biceps brachii? What is a pognophobe? Is it weird to get erections?

What is eye to eye and tooth to tooth?