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1. What is the advantage of the countercurrent gas exchange in the case of some molluscs? Why is it not present in all representatives?
2. Discuss the diversity of the different molluscan groups in terms of body systems and adaptations. Are the differences necessary? Defend your answer.
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- For Phylum Mollusca, Class Cephalopod 1. 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. 2. 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.1. Cite 5 characteristics of sponges: 2. Which characteristics are unique to ctenophores? 3. Cnidarians are diploblastic, possessing an ectoderm and endoderm. Name the gelatinous nonliving material found between these two tissues. What cells are found within this gelatinous tissue? List the functions of these cells. 4. Polyp body consists of a tubular sessile body. True or false? 5. Define radial and bilateral symmetry, and protostomes and deuterostomes: 6. The presence of two different body forms, or dimorphism, is seen in the phylum Cnidaria. The form resembles an "upside-down cup" with tentacles, and the body form consists of a tubular sessile body. Hydra is an example of the body form, and a jellyfish is an example of the pody form.1. Compare and contrast the efficiency of the different organ systems and adaptations between cnidarians and ctenophorans. Which is more efficient overall and why? 2. What are the major adaptations and characteristics present in free-living flatworms that are absent in their parasitic counterparts? Discuss how these characteristics support their lifestyles.
- Which of the following is not true of Acanthostega? It was aquatic It had gills It had four limbs It laid shelled eggs.1. What are the major adaptations that allow nemertines to thrive in the marine environment? Support your answer. 2. What is the advantage of the countercurrent gas exchange in the case of some molluscs? Why is it not present in all representatives?1. State the function of the following parts of the genus Romalea (grasshopper): antenna, tympanum, spiracles, ovipositor (female), gastric caeca, malphigian tubules, tracheae, air sacs What are the hairlike appendages called that anchor into the skin of annelids? What structures do earthworms have to help dispose of nitrogenous wastes? Briefly describe how earthworms reproduce and what structures are involved.
- 1. Define sessile. Name an invertebrate with a sessile adult stage. 2. Sponges have specialized cells called collar cells. Describe how collar cells are specialized for the functions they serve. 3. What is a nematocyst? What is its function? 4. How do coral reefs form? 5. How do free-living nematodes contribute to the carbon cycle? 6. Describe the basic body plan of a mollusk. 7. What are gills? What is their function?1. What are the unifying characteristics of Gnathifera? Are these characteristics present in all members of the group? Is there a need for them to be placed in this group? Why or why not? 2. Account for the success of parasitic flatworms. Cite specific strategies to support your answer.For phylum Mollusca, Class Cephalopod 1. Characteristics. List whether the organism is:a. Diploblastic or triploblastic (if applicable) b. Deuterostome or protostome (if applicable) c. Coelomate, pseudocoelomate or eucoelomate (if applicable) 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? 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 the animal.
- 6. How would increasing ocean acidification due to global warming likely affect marine molluscs (be specific) 11. Name the two protostome clades and give one diagnostic feature for each. Please answer asap and type your answer and answer should not be palgarised1. Compare and contrast an Acanthocephalan and a Rotifer by providing 5 points of comparison. Point of comparison Rotifer Acanthocephalan 1. 2. 3. 4. 5. 2. What structures are found in Acanthocephalans which allows them to perform its endoparasitic life? Explain1.Differentiate the three phyla of Worms in terms of their body structure, habits and importance. 2. Differentiate the classes of Mollusca based on their body structures