Respuesta :
Foraminifera's and radiolarians are two groups of protists produce hard, mineralized skeletal structures or cell walls that contribute to marine sediments and form fossils.
Any protozoan belonging to the superclass Actinopoda, or the radiolarian, is found in the upper oceanic layers. The elaborate and exquisitely sculpted tests, or skeletons, of radiolarians, which are primarily spherically symmetrical, are well recognized. The test, which is often made of silica, is intricately perforated in a variety of designs to create either a succession of latticelike plates or loose needle-shaped spicules. The skeleton's holes are filled with pseudopodia. The nuclei are enclosed and the cytoplasm is split into two zones by a chitinous central capsule. Numerous vacuoles found in the outer cytoplasm regulate the organism's buoyancy. Asexual reproduction can occur by binary, multiple, or budding fission. In most cases, as the skeleton splits, each daughter cell regenerates the lost half. However, in some circumstances, one daughter cell escapes.
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