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 Three Present Endoskeleton (calcareous plates) Notes: Body covered with spines. Tube feet in rows on body Question 4. The organism is thought to be more closely related to members of which other phylum? a. Arthropoda D. Chordata C. Mollusca Platyhelminthes e. Nematoda

Explanation / Answer

b. chordata

Reason: the organism seems to be related to the phylum Echinodermata which is closely related to chordata, it has tube feet tyoe respiratory system, body is covered with spines, body has no segmentation and has a true coelom body cavity of them all and a calcareous endoskeleton which is a typical of Echinoderms.

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