This resource appears to be designed to build towards this crosscutting concept, though the resource developer has not explicitly stated so.
Comments about Including the Crosscutting Concept
The lesson focuses on how the form of an organism's structure (e.g., shape/number of teeth, size of bones, etc.) provides evidence on what the organism was like. It is recommended that the teacher explicitly explore the relationship between form and function with students and how it is the basis of inference toward what we think we know about organisms that lived long ago. Consider constructing a chart with students illustrating the relationship between form and function of observable, present day organisms (such as the horse) and what we think we know about organisms from fossils.