Which of the following would be found in a sea urchin (phylum Echinodermata)? A. A dorsal hollow nerve cord B. An endoskeleton C. Schizocoelus coelom formation D. A trochophore larva E. All of the above
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- Which of the following characteristics is not seen in the phylum Platyhelminthes?a. cephalizationb. the presence of a mesodermc. specialization of the digestive tractd. bilateral symmetryWhich of the following characteristics are unique to a ctenophore? Do not possess nematocysts; A swim by using comb plates. Possess nematocysts; swim by В using comb plates. Have adhesive cells, or C colloblasts, for capturing food. D Both a and c. Both b and c.Discuss why some sa that hemichordates are said to be the missing link between the invertebrates and vertebrates.
- In echinoderms, the main coelomic compartment is completely converted into the water-vascular system. restricted to a small space around the gonads. the pyloric stomach. O missing. a somatocoel.The only class or group of Annelid worms which possesses a permanent clitellum is the: Hirudina Cestoda Oligochaeta Platyhelminthes Permoclitellata All lack a permanent clitellum PolychaetaThe defining feature of the cnidarians is that they all have nematocytes (cnidocytes). These cells; Are nerve cells that allow the cnidarians to sense the environment Are cells lining the gastrovascular cavity Are filter feeding cells on the tentacles Are stinging cells on the tentacles
- Compare the whole specimens and cross-sections of Ascaris and Dugesia. How would you differentiate these worms? Also, nematodes have a complete gut whereas most platyhelminths have an incomplete one. Think of one advantage of having a complete gut.Which of these does not pertain to a protostome?a. spiral cleavageb. blastopore is associated with the anusc. coelom, splitting of mesodermd. annelids, arthropods, and molluscse. mouth is associated with first openingThe earthworms are different than the leaches in that the earthworms move by; Using chetae to anchor themselves and then crawl using a whip like motion to propel themselves Using doral and ventral suckers to inchworm using small appendages called parapodia
- Which of the 4 characteristics of Phylum Chordata is visible on this organism? Pharyngeal slits Dorsal hollow nerve cord Notochord Post-anal tailThe planula stage in Cnidarians is similar to what life stage in two other non-animal organisms? Explain how they are similar and why they are necessary. Please pay attention, it is talking about NON-animal organisms. Please talk about the stages ONLY.For phylum Echinoderms and class Crinoidea 1. Characteristics. List whether the organism is:a. Diploblastic or triploblastic (if applicable) b. Deuterostome or protostome (if applicable) c. Coelomate, pseudocoelomate or eucoelomate 2. Organ/system characteristics. Answer the following for each organism:a. How is their circulatory system? b. Excretory/osmoregulation: How does the organism eliminate waste? What organs do they use?c. Skeleton/support: List the structures or ways this organism supports itself. 3. Ecology. Describe/answer the following for each organism:a. Does it have a complete or incomplete digestive system? How does this animal feed?b. Identify any unique feeding structure• Be sure to use the correct terms to identify any unique feeding structure(s) used by theanimal.