What function makes cell attachments leak proof?

What is the index of refraction (n)? What are the some desirable traits for a leader to have? Of the first 103 elements how many have just two letter in their symbols? Why do water lilies not grow well in moving water? What are facts about plant pigments? What happens to the ocean when there is an earthquake? Will caffeine in significant dosages kill a human? What world leaders made up the Big Three during World War 2? What happens when a hurricane hits another hurricane? How do you calibrate spectrophotometer? What are the starting molecules for light independent reactions? How can you get the 240 volt cut back to 208 volt without the use of a transformer? What is the percentage of each mineral In gabbro? What impact can the bottleneck effect have on populations that have rebounded after near extinction? What causes an Asteroid to blow up? Is yogurt composed of cells? A portion of the body that is located above the transverse plane is said to be? Having a body temperature that changes as the outside temperature changes as a insect? What is unique about vegetation in the desert and tundra regions? What is the name of the mountains that are mostly located in Arkansas?