The term "visceral mass" refers to a soft, internal part of certain animals, particularly invertebrates like mollusks. This mass contains vital organs such as the digestive, reproductive, and excretory systems. In creatures like snails and clams, the visceral mass is often protected by a hard shell, which helps safeguard these essential organs from predators and environmental hazards. In addition to mollusks, the concept of visceral mass can also apply to other organisms, where it represents the central body area housing critical functions. Understanding the visceral mass helps scientists study the anatomy and physiology of various species, revealing how they adapt to their environments.