Second grade scientists concluded their study of invertebrates with a lab focused on shells. We learned that shells are the exoskeletons of soft-bodied marine animals. They are classified into two main groups: gastropods and bivalves. Gastropods have a single shell which spirals outward and to one side as it grows. Bivalves have two shells that are hinged together. We looked at examples of each and my biologists learned to identify some common shells as they matched them to pictures. Afterwards, we quizzed each other.

What do you hear in a shell? Click here to find out.