(1) Many of the products humans use today have their inspirations in nature.(2) The airplane is a well- known example: watching the flight of birds inspired generations of inventors to develop and perfect aviation technology. (3) Similarly product developers in the adhesive industry (tape, glue, sticky notes) are looking to animals for inspiration. (4) The reason is that many naturally occurring animal adhesives are superior to traditional human made adhesives. (5) The tiny hairs on the gecko's feet allow the lizard to adhere to walls and ceilings. (6) The waterproof, adhesive proteins of zebra mussels make it possible for them to cling to underwater rocks even in the roughest water conditions. (7) Studies of the "sticking power"of geckos and zebra mussels resulted in the invention of a product that combines the adhesive properties of the two animals.(8) This product, effective if used wet or dry, contains tiny pillars designed after gecko hairs as well as an outer coating of adhesive protein inspired by zebra mussels. (9) Another recent invention was inspired by the sticky feet of a frog. (10) The adhesive foot pads of the tree frog are much stickier than most human -made adhesives. (11) The frog's grooved foot pads "self- clean" by secreting a mucus-like liquid. (12)The stickiness of the foot pad is restored.(13) Inspired by these foot pads, scientists used silicone oil to boost the sticking power of a grooved adhesive tape they developed. (14) The resulting product not only clings strongly but can re stick up to twenty-five times without weakening. Question Where would the following sentence best be placed? Both geckos and zebra mussels have impressed product developers with their adhesive abilities. Before sentence 2 Before sentence 5 Before sentence 8 Before sentence 10