Select the correct text in the passage. A writer is using the following excerpt to write a paper about variety in bird species: excerpt adapted from What Is That Bird? by the US Fish and Wildlife Service

Learning the basic form and structure, or morphology, of a bird will help you to make comparisons of birds. Concentrate on the shape and size of the beak, including the relative size of the upper and lower beak; length of the outer tail feathers, upper flight feathers, and throat; and the coloration of the crown and breast. It will also help you to think about the types of habitat in which you are most likely to find specific birds, since the birds that you see may be migratory and will only be in your area at a specific time of the year. 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.