The student will be able to describe the process of human development including major changes that occur in each trimester of pregnancy. Students will become scientists and explore the major changes that occur during embryo development. First, students will work in groups and correctly match the fetal development picture cards with the appropriate description. Next, students compare and share their findings with other groups and record this data. Finally, students will act as physicians as they investigate a medical case study of a pregnant woman and determine what trimester she is in by analyzing ultrasound reports detailing certain makers of the stages of development. Students will use a claim, evidence, rationale style activity using the ultrasound pictures and learned content to support their answers. The lesson culminates with students sharing their findings through a gallery walk.