👉 Graptolitic refers to organisms that have a symbiotic relationship with algae. These organisms are able to extract nutrients from the surface of the water, which is typically rich in nutrients such as nitrogen and phosphorus. Graptolites are found in various environments, including lakes, rivers, and oceans. The term "graptolite" comes from the Greek word "graphtos," which means "to grasp." The organism in question grasps onto the surface of the water to