The correct answer is option 2 - Sponge. Sponges are sedentary animals, which means they are unable to change their place or move around. They are attached to a surface, such as rocks or the sea floor, and rely on water currents to bring them food and oxygen. Sponges have a unique body structure with numerous pores that allow water to flow through them, which helps them filter out microscopic organisms for food. While other animals like starfish, hydra, and leech have the ability to move and change their location, sponges lack this ability. They mainly rely on their environment for their survival.