Radiolarians are single-celled marine organisms known for their intricate silica skeletons. They belong to the group of protists and are primarily found in oceanic waters. Radiolarians play a crucial role in the marine ecosystem, contributing to the ocean's food web and the cycling of nutrients. These microscopic creatures reproduce asexually and can be found at various depths in the ocean. Their skeletons accumulate on the ocean floor after they die, forming sedimentary deposits that can be studied by scientists to understand past ocean conditions and climate changes.