17. Name an analogous structure between a fly and a bat.

analogous structure between a fly and a bat is their wings. Both have wings that allow them to fly, but the structures of their wings are different. A fly's wings are made of a thin membrane stretched over a framework of veins, while a bat's wings are made of skin stretched over elongated fingers. Despite these differences, the function of the wings in both animals is similar, allowing them to fly and navigate through the air.