Sessile Invertebrates
Sessile invertebrates are organisms that lack a backbone or vertebral column and are characterized by their stationary, fixed attachment to a surface. These organisms typically include various species of marine and freshwater animals, such as sponges, barnacles, sea anemones, and certain species of corals. Sessile invertebrates rely on external sources for food and are often filter feeders, absorbing nutrients from the surrounding water or substrate. They play important roles in their ecosystems by providing habitats for other organisms and contributing to nutrient cycling.