Чем объясняется многообразие функций белков?

Is your room big,Jane?It`s small but there is a big window..Is there...any furniture?Oh yes. There is .a bed, a desk and .some..bokshelves..IS there..a wardrobe?Yes .there is ..And .there are ..nice curtains.What.is there...on the walls? .there are..photos of my family and friends.And ..there is .a Stor Trek poster.