Use the information below to answer questions 3 and 4 In your research you disco

Question

Use the information below to answer questions 3 and 4 In your research you discover a never before described species of animal with the following characteristics: Field Notes: Adult specimen was found in inter-tidal zone - feeding on seaweed Laboratory Analysis: Size: Spherical in shape 18 cm in diameter Symmetry: Radial Cephalization: Absent Segmentation: Absent Reproduction: Sexual (Female) Organs: Skeleton: Body Cavity: Germ Layers: Digestive System: Complete Circulatory System: Absent Respiration System: Tube Feet Nervous System:Nerve ring, Radial nerves Excretory System Absent Coelom I hree Present Endoskeleton (calcareous plates) Notes: Body covered with spines. Tube feet in rows on body Question 3. The organism would traditionally be classified into which Phylum? a. Cnidaria b. Rotifera C. Echinodermata Porifera e. Annelida

Explanation / Answer

The organism would traditionally be classified into the phylum Echinodermata. Echinoderms have radial symmetry. They do not have cephalization and segmentation. They reproduce sexually and they have organs. They have endoskeleton that is composed of calcareous plates also known as ossicles. They have coelomic body cavity and they have three germ layers. Their digestive system is complete and they have an open circulatory system where cilia circulate the blood and maintain the pressure. They have tube feet that assist them with respiratory, circulatory, and nervous system functions. The central nervous system of an adult echinoderm is composed of a nerve ring that is connected to radial nerve cords. They do not possess specialized excretory organs. So, the correct option is option C, Echinodermata.

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