Which sentence should the writer revise to include an in-text citation? Bird-watching novices might be impressed by just how many different species of birds there are. Birds come in a wide range of shapes, sizes,
and colors. Some of the most important bird features include the shape of the beak, the length of various feathers, and the coloration of the
bird's crown. Bird biology has a lot to do with these differing characteristics, since most bird features serve at least one purpose in the animals
lives.