Anatomical model of river clam

  The anatomical structure of a river clam, which is scientifically known as *Unio* or *Anodonta* species, includes several key parts that allow it to live in freshwater environments. Here's an overview of the main anatomical features:   1. **Shell**: River clams have two shells (valves) that are hinged together on one side. The shell provides protection for the soft body inside and can close tightly to protect the animal from predators.   2. **Foot**: The foot is a muscular organ located at the bottom of the clam. It is used for locomotion and anchoring the clam to the substrate (like sand or mud). The foot can extend out from between the shells when the clam needs to move or burrow.   3. **Mantle**: The mantle is a thin layer of tissue that lines the inner surface of the shell and extends outside the shell opening. It secretes the material that forms the shell and also helps in respiration by exchanging gases with the water.   4. **Gills (Ctenidia)**: Clams…