Question: describe what are the main characteristics of foraminiferans radiolarians and ciliates?
Answer: Radiolarians are planktonic, have silica skeletons, use pseudopodia just like foraminiferans, and are often spherical with spines. Ciliates are covered in cilia or hair-like protrusions, occupy a diverse set of habitats, and play an important role in open-water food webs.